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Finding the Fourth Proportional to 100,672.47, 138,925.05 and 55,350.40

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Solution

The fourth proportional to 100,672.47, 138,925.05 and 55,350.40 is: 76,381.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,672.47 : 138,925.05 = 55,350.40 : x
  2. Step 2: Convert to fraction form
    100,672.47/138,925.05 = 55,350.40/x
  3. Step 3: Cross multiply
    100,672.47x = 138,925.05 × 55,350.40
  4. Step 4: Simplify right side
    100,672.47x = 7,689,557,087.52
  5. Step 5: Solve for x
    x = 7,689,557,087.52/100,672.47
  6. Step 6: Final answer
    x = 76,381.93

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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.