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Finding the Fourth Proportional to 97.78, 146.66 and 77.42

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Solution

The fourth proportional to 97.78, 146.66 and 77.42 is: 116.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    97.78 : 146.66 = 77.42 : x
  2. Step 2: Convert to fraction form
    97.78/146.66 = 77.42/x
  3. Step 3: Cross multiply
    97.78x = 146.66 × 77.42
  4. Step 4: Simplify right side
    97.78x = 11,354.42
  5. Step 5: Solve for x
    x = 11,354.42/97.78
  6. Step 6: Final answer
    x = 116.12

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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.