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Finding the Fourth Proportional to 177.78, 266.78 and 91.11

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Solution

The fourth proportional to 177.78, 266.78 and 91.11 is: 136.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    177.78 : 266.78 = 91.11 : x
  2. Step 2: Convert to fraction form
    177.78/266.78 = 91.11/x
  3. Step 3: Cross multiply
    177.78x = 266.78 × 91.11
  4. Step 4: Simplify right side
    177.78x = 24,306.33
  5. Step 5: Solve for x
    x = 24,306.33/177.78
  6. Step 6: Final answer
    x = 136.72

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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.