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Finding the Fourth Proportional to 485,411.40, 728,117.10 and 396,837.90

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Solution

The fourth proportional to 485,411.40, 728,117.10 and 396,837.90 is: 595,256.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,411.40 : 728,117.10 = 396,837.90 : x
  2. Step 2: Convert to fraction form
    485,411.40/728,117.10 = 396,837.90/x
  3. Step 3: Cross multiply
    485,411.40x = 728,117.10 × 396,837.90
  4. Step 4: Simplify right side
    485,411.40x = 288,944,460,918.09
  5. Step 5: Solve for x
    x = 288,944,460,918.09/485,411.40
  6. Step 6: Final answer
    x = 595,256.85

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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.