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Finding the Fourth Proportional to 97.85, 134.85 and 77.11

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Solution

The fourth proportional to 97.85, 134.85 and 77.11 is: 106.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.85 : 134.85 = 77.11 : x
  2. Step 2: Convert to fraction form
    97.85/134.85 = 77.11/x
  3. Step 3: Cross multiply
    97.85x = 134.85 × 77.11
  4. Step 4: Simplify right side
    97.85x = 10,397.61
  5. Step 5: Solve for x
    x = 10,397.61/97.85
  6. Step 6: Final answer
    x = 106.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.