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Finding the Fourth Proportional to 266,439.55, 399,686.20 and 86,517.44

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Solution

The fourth proportional to 266,439.55, 399,686.20 and 86,517.44 is: 129,784.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,439.55 : 399,686.20 = 86,517.44 : x
  2. Step 2: Convert to fraction form
    266,439.55/399,686.20 = 86,517.44/x
  3. Step 3: Cross multiply
    266,439.55x = 399,686.20 × 86,517.44
  4. Step 4: Simplify right side
    266,439.55x = 34,579,827,610.25
  5. Step 5: Solve for x
    x = 34,579,827,610.25/266,439.55
  6. Step 6: Final answer
    x = 129,784.89

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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.