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Finding the Fourth Proportional to 399,487.71, 551,292.15 and 229,721.85

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Solution

The fourth proportional to 399,487.71, 551,292.15 and 229,721.85 is: 317,015.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,487.71 : 551,292.15 = 229,721.85 : x
  2. Step 2: Convert to fraction form
    399,487.71/551,292.15 = 229,721.85/x
  3. Step 3: Cross multiply
    399,487.71x = 551,292.15 × 229,721.85
  4. Step 4: Simplify right side
    399,487.71x = 126,643,852,588.48
  5. Step 5: Solve for x
    x = 126,643,852,588.48/399,487.71
  6. Step 6: Final answer
    x = 317,015.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.