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Finding the Fourth Proportional to 157.78, 217.76 and 101.74

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Solution

The fourth proportional to 157.78, 217.76 and 101.74 is: 140.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.78 : 217.76 = 101.74 : x
  2. Step 2: Convert to fraction form
    157.78/217.76 = 101.74/x
  3. Step 3: Cross multiply
    157.78x = 217.76 × 101.74
  4. Step 4: Simplify right side
    157.78x = 22,154.87
  5. Step 5: Solve for x
    x = 22,154.87/157.78
  6. Step 6: Final answer
    x = 140.42

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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.