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Finding the Fourth Proportional to 399,899.20, 551,861.98 and 218,613.28

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Solution

The fourth proportional to 399,899.20, 551,861.98 and 218,613.28 is: 301,686.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,899.20 : 551,861.98 = 218,613.28 : x
  2. Step 2: Convert to fraction form
    399,899.20/551,861.98 = 218,613.28/x
  3. Step 3: Cross multiply
    399,899.20x = 551,861.98 × 218,613.28
  4. Step 4: Simplify right side
    399,899.20x = 120,644,357,555.09
  5. Step 5: Solve for x
    x = 120,644,357,555.09/399,899.20
  6. Step 6: Final answer
    x = 301,686.92

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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.