Home / 579,504.20-869,256.30-390,547.40

Finding the Fourth Proportional to 579,504.20, 869,256.30 and 390,547.40

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Solution

The fourth proportional to 579,504.20, 869,256.30 and 390,547.40 is: 585,821.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,504.20 : 869,256.30 = 390,547.40 : x
  2. Step 2: Convert to fraction form
    579,504.20/869,256.30 = 390,547.40/x
  3. Step 3: Cross multiply
    579,504.20x = 869,256.30 × 390,547.40
  4. Step 4: Simplify right side
    579,504.20x = 339,485,787,898.62
  5. Step 5: Solve for x
    x = 339,485,787,898.62/579,504.20
  6. Step 6: Final answer
    x = 585,821.10

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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.