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Finding the Fourth Proportional to 99.42, 136.20 and 98.88

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Solution

The fourth proportional to 99.42, 136.20 and 98.88 is: 135.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.42 : 136.20 = 98.88 : x
  2. Step 2: Convert to fraction form
    99.42/136.20 = 98.88/x
  3. Step 3: Cross multiply
    99.42x = 136.20 × 98.88
  4. Step 4: Simplify right side
    99.42x = 13,467.46
  5. Step 5: Solve for x
    x = 13,467.46/99.42
  6. Step 6: Final answer
    x = 135.46

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.