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Finding the Fourth Proportional to 99.42, 148.98 and 91.04

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Solution

The fourth proportional to 99.42, 148.98 and 91.04 is: 136.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.42 : 148.98 = 91.04 : x
  2. Step 2: Convert to fraction form
    99.42/148.98 = 91.04/x
  3. Step 3: Cross multiply
    99.42x = 148.98 × 91.04
  4. Step 4: Simplify right side
    99.42x = 13,563.14
  5. Step 5: Solve for x
    x = 13,563.14/99.42
  6. Step 6: Final answer
    x = 136.42

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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.