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Finding the Fourth Proportional to 485,411.20, 728,116.80 and 272,834.80

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Solution

The fourth proportional to 485,411.20, 728,116.80 and 272,834.80 is: 409,252.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,411.20 : 728,116.80 = 272,834.80 : x
  2. Step 2: Convert to fraction form
    485,411.20/728,116.80 = 272,834.80/x
  3. Step 3: Cross multiply
    485,411.20x = 728,116.80 × 272,834.80
  4. Step 4: Simplify right side
    485,411.20x = 198,655,601,504.64
  5. Step 5: Solve for x
    x = 198,655,601,504.64/485,411.20
  6. Step 6: Final answer
    x = 409,252.20

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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.