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Finding the Fourth Proportional to 132.07, 197.90 and 77.90

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Solution

The fourth proportional to 132.07, 197.90 and 77.90 is: 116.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    132.07 : 197.90 = 77.90 : x
  2. Step 2: Convert to fraction form
    132.07/197.90 = 77.90/x
  3. Step 3: Cross multiply
    132.07x = 197.90 × 77.90
  4. Step 4: Simplify right side
    132.07x = 15,416.02
  5. Step 5: Solve for x
    x = 15,416.02/132.07
  6. Step 6: Final answer
    x = 116.73

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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.