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Finding the Fourth Proportional to 99.89, 137.88 and 72.24

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Solution

The fourth proportional to 99.89, 137.88 and 72.24 is: 99.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.89 : 137.88 = 72.24 : x
  2. Step 2: Convert to fraction form
    99.89/137.88 = 72.24/x
  3. Step 3: Cross multiply
    99.89x = 137.88 × 72.24
  4. Step 4: Simplify right side
    99.89x = 9,960.45
  5. Step 5: Solve for x
    x = 9,960.45/99.89
  6. Step 6: Final answer
    x = 99.72

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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.