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Finding the Fourth Proportional to 99,691.74, 137,573.91 and 54,979.74

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Solution

The fourth proportional to 99,691.74, 137,573.91 and 54,979.74 is: 75,871.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,691.74 : 137,573.91 = 54,979.74 : x
  2. Step 2: Convert to fraction form
    99,691.74/137,573.91 = 54,979.74/x
  3. Step 3: Cross multiply
    99,691.74x = 137,573.91 × 54,979.74
  4. Step 4: Simplify right side
    99,691.74x = 7,563,777,802.58
  5. Step 5: Solve for x
    x = 7,563,777,802.58/99,691.74
  6. Step 6: Final answer
    x = 75,871.66

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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.