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Finding the Fourth Proportional to 99.42, 137.20 and 62.54

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Solution

The fourth proportional to 99.42, 137.20 and 62.54 is: 86.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.42 : 137.20 = 62.54 : x
  2. Step 2: Convert to fraction form
    99.42/137.20 = 62.54/x
  3. Step 3: Cross multiply
    99.42x = 137.20 × 62.54
  4. Step 4: Simplify right side
    99.42x = 8,580.49
  5. Step 5: Solve for x
    x = 8,580.49/99.42
  6. Step 6: Final answer
    x = 86.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.