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Finding the Fourth Proportional to 99.32, 149.50 and 89.89

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Solution

The fourth proportional to 99.32, 149.50 and 89.89 is: 135.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.32 : 149.50 = 89.89 : x
  2. Step 2: Convert to fraction form
    99.32/149.50 = 89.89/x
  3. Step 3: Cross multiply
    99.32x = 149.50 × 89.89
  4. Step 4: Simplify right side
    99.32x = 13,437.96
  5. Step 5: Solve for x
    x = 13,437.96/99.32
  6. Step 6: Final answer
    x = 135.30

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.