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Finding the Fourth Proportional to 99.89, 137.91 and 75.44

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Solution

The fourth proportional to 99.89, 137.91 and 75.44 is: 104.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.89 : 137.91 = 75.44 : x
  2. Step 2: Convert to fraction form
    99.89/137.91 = 75.44/x
  3. Step 3: Cross multiply
    99.89x = 137.91 × 75.44
  4. Step 4: Simplify right side
    99.89x = 10,403.93
  5. Step 5: Solve for x
    x = 10,403.93/99.89
  6. Step 6: Final answer
    x = 104.15

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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.