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Finding the Fourth Proportional to 100,658.59, 138,910.56 and 55,338.46

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Solution

The fourth proportional to 100,658.59, 138,910.56 and 55,338.46 is: 76,368.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,658.59 : 138,910.56 = 55,338.46 : x
  2. Step 2: Convert to fraction form
    100,658.59/138,910.56 = 55,338.46/x
  3. Step 3: Cross multiply
    100,658.59x = 138,910.56 × 55,338.46
  4. Step 4: Simplify right side
    100,658.59x = 7,687,096,468.14
  5. Step 5: Solve for x
    x = 7,687,096,468.14/100,658.59
  6. Step 6: Final answer
    x = 76,368.01

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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.