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Finding the Fourth Proportional to 485,856.90, 728,785.35 and 384,380.10

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Solution

The fourth proportional to 485,856.90, 728,785.35 and 384,380.10 is: 576,570.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,856.90 : 728,785.35 = 384,380.10 : x
  2. Step 2: Convert to fraction form
    485,856.90/728,785.35 = 384,380.10/x
  3. Step 3: Cross multiply
    485,856.90x = 728,785.35 × 384,380.10
  4. Step 4: Simplify right side
    485,856.90x = 280,130,585,711.54
  5. Step 5: Solve for x
    x = 280,130,585,711.54/485,856.90
  6. Step 6: Final answer
    x = 576,570.15

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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.