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Finding the Fourth Proportional to 177.78, 266.78 and 99.76

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Solution

The fourth proportional to 177.78, 266.78 and 99.76 is: 149.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    177.78 : 266.78 = 99.76 : x
  2. Step 2: Convert to fraction form
    177.78/266.78 = 99.76/x
  3. Step 3: Cross multiply
    177.78x = 266.78 × 99.76
  4. Step 4: Simplify right side
    177.78x = 26,613.97
  5. Step 5: Solve for x
    x = 26,613.97/177.78
  6. Step 6: Final answer
    x = 149.70

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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.