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Finding the Fourth Proportional to 485,128.80, 727,693.20 and 343,411.20

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Solution

The fourth proportional to 485,128.80, 727,693.20 and 343,411.20 is: 515,116.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,128.80 : 727,693.20 = 343,411.20 : x
  2. Step 2: Convert to fraction form
    485,128.80/727,693.20 = 343,411.20/x
  3. Step 3: Cross multiply
    485,128.80x = 727,693.20 × 343,411.20
  4. Step 4: Simplify right side
    485,128.80x = 249,897,995,043.84
  5. Step 5: Solve for x
    x = 249,897,995,043.84/485,128.80
  6. Step 6: Final answer
    x = 515,116.80

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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.