Home / 579,385.20-869,077.80-390,428.40

Finding the Fourth Proportional to 579,385.20, 869,077.80 and 390,428.40

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Solution

The fourth proportional to 579,385.20, 869,077.80 and 390,428.40 is: 585,642.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,385.20 : 869,077.80 = 390,428.40 : x
  2. Step 2: Convert to fraction form
    579,385.20/869,077.80 = 390,428.40/x
  3. Step 3: Cross multiply
    579,385.20x = 869,077.80 × 390,428.40
  4. Step 4: Simplify right side
    579,385.20x = 339,312,654,929.52
  5. Step 5: Solve for x
    x = 339,312,654,929.52/579,385.20
  6. Step 6: Final answer
    x = 585,642.60

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.