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Finding the Fourth Proportional to 266,428.40, 399,691.20 and 108,672.80

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Solution

The fourth proportional to 266,428.40, 399,691.20 and 108,672.80 is: 163,029.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    266,428.40 : 399,691.20 = 108,672.80 : x
  2. Step 2: Convert to fraction form
    266,428.40/399,691.20 = 108,672.80/x
  3. Step 3: Cross multiply
    266,428.40x = 399,691.20 × 108,672.80
  4. Step 4: Simplify right side
    266,428.40x = 43,435,561,839.36
  5. Step 5: Solve for x
    x = 43,435,561,839.36/266,428.40
  6. Step 6: Final answer
    x = 163,029.02

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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.