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Finding the Fourth Proportional to 399,455.28, 551,245.28 and 218,167.29

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Solution

The fourth proportional to 399,455.28, 551,245.28 and 218,167.29 is: 301,069.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,455.28 : 551,245.28 = 218,167.29 : x
  2. Step 2: Convert to fraction form
    399,455.28/551,245.28 = 218,167.29/x
  3. Step 3: Cross multiply
    399,455.28x = 551,245.28 × 218,167.29
  4. Step 4: Simplify right side
    399,455.28x = 120,263,687,772.06
  5. Step 5: Solve for x
    x = 120,263,687,772.06/399,455.28
  6. Step 6: Final answer
    x = 301,069.22

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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.