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Finding the Fourth Proportional to 131.32, 197.15 and 85.11

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Solution

The fourth proportional to 131.32, 197.15 and 85.11 is: 127.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.32 : 197.15 = 85.11 : x
  2. Step 2: Convert to fraction form
    131.32/197.15 = 85.11/x
  3. Step 3: Cross multiply
    131.32x = 197.15 × 85.11
  4. Step 4: Simplify right side
    131.32x = 16,779.65
  5. Step 5: Solve for x
    x = 16,779.65/131.32
  6. Step 6: Final answer
    x = 127.78

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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.