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Finding the Fourth Proportional to 89.47, 133.78 and 66.42

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Solution

The fourth proportional to 89.47, 133.78 and 66.42 is: 99.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.47 : 133.78 = 66.42 : x
  2. Step 2: Convert to fraction form
    89.47/133.78 = 66.42/x
  3. Step 3: Cross multiply
    89.47x = 133.78 × 66.42
  4. Step 4: Simplify right side
    89.47x = 8,885.67
  5. Step 5: Solve for x
    x = 8,885.67/89.47
  6. Step 6: Final answer
    x = 99.31

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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.