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Finding the Fourth Proportional to 99.87, 149.70 and 88.41

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Solution

The fourth proportional to 99.87, 149.70 and 88.41 is: 132.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.87 : 149.70 = 88.41 : x
  2. Step 2: Convert to fraction form
    99.87/149.70 = 88.41/x
  3. Step 3: Cross multiply
    99.87x = 149.70 × 88.41
  4. Step 4: Simplify right side
    99.87x = 13,234.98
  5. Step 5: Solve for x
    x = 13,234.98/99.87
  6. Step 6: Final answer
    x = 132.52

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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.