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Finding the Fourth Proportional to 399,588.50, 551,432.13 and 220,740.50

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Solution

The fourth proportional to 399,588.50, 551,432.13 and 220,740.50 is: 304,621.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,588.50 : 551,432.13 = 220,740.50 : x
  2. Step 2: Convert to fraction form
    399,588.50/551,432.13 = 220,740.50/x
  3. Step 3: Cross multiply
    399,588.50x = 551,432.13 × 220,740.50
  4. Step 4: Simplify right side
    399,588.50x = 121,723,404,092.27
  5. Step 5: Solve for x
    x = 121,723,404,092.27/399,588.50
  6. Step 6: Final answer
    x = 304,621.89

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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.