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Finding the Fourth Proportional to 579,387.20, 869,080.80 and 390,430.40

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Solution

The fourth proportional to 579,387.20, 869,080.80 and 390,430.40 is: 585,645.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,387.20 : 869,080.80 = 390,430.40 : x
  2. Step 2: Convert to fraction form
    579,387.20/869,080.80 = 390,430.40/x
  3. Step 3: Cross multiply
    579,387.20x = 869,080.80 × 390,430.40
  4. Step 4: Simplify right side
    579,387.20x = 339,315,564,376.32
  5. Step 5: Solve for x
    x = 339,315,564,376.32/579,387.20
  6. Step 6: Final answer
    x = 585,645.60

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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.