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Finding the Fourth Proportional to 131.34, 196.86 and 77.16

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Solution

The fourth proportional to 131.34, 196.86 and 77.16 is: 115.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.34 : 196.86 = 77.16 : x
  2. Step 2: Convert to fraction form
    131.34/196.86 = 77.16/x
  3. Step 3: Cross multiply
    131.34x = 196.86 × 77.16
  4. Step 4: Simplify right side
    131.34x = 15,189.72
  5. Step 5: Solve for x
    x = 15,189.72/131.34
  6. Step 6: Final answer
    x = 115.65

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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.