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Finding the Fourth Proportional to 157.69, 217.60 and 87.74

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Solution

The fourth proportional to 157.69, 217.60 and 87.74 is: 121.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.69 : 217.60 = 87.74 : x
  2. Step 2: Convert to fraction form
    157.69/217.60 = 87.74/x
  3. Step 3: Cross multiply
    157.69x = 217.60 × 87.74
  4. Step 4: Simplify right side
    157.69x = 19,092.96
  5. Step 5: Solve for x
    x = 19,092.96/157.69
  6. Step 6: Final answer
    x = 121.08

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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.