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Finding the Fourth Proportional to 132.02, 198.38 and 71.20

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Solution

The fourth proportional to 132.02, 198.38 and 71.20 is: 106.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.02 : 198.38 = 71.20 : x
  2. Step 2: Convert to fraction form
    132.02/198.38 = 71.20/x
  3. Step 3: Cross multiply
    132.02x = 198.38 × 71.20
  4. Step 4: Simplify right side
    132.02x = 14,123.66
  5. Step 5: Solve for x
    x = 14,123.66/132.02
  6. Step 6: Final answer
    x = 106.98

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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.