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Finding the Fourth Proportional to 99.50, 149.05 and 60.87

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Solution

The fourth proportional to 99.50, 149.05 and 60.87 is: 91.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.50 : 149.05 = 60.87 : x
  2. Step 2: Convert to fraction form
    99.50/149.05 = 60.87/x
  3. Step 3: Cross multiply
    99.50x = 149.05 × 60.87
  4. Step 4: Simplify right side
    99.50x = 9,071.62
  5. Step 5: Solve for x
    x = 9,071.62/99.50
  6. Step 6: Final answer
    x = 91.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.