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Finding the Fourth Proportional to 158.87, 219.24 and 87.97

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Solution

The fourth proportional to 158.87, 219.24 and 87.97 is: 121.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.87 : 219.24 = 87.97 : x
  2. Step 2: Convert to fraction form
    158.87/219.24 = 87.97/x
  3. Step 3: Cross multiply
    158.87x = 219.24 × 87.97
  4. Step 4: Simplify right side
    158.87x = 19,286.87
  5. Step 5: Solve for x
    x = 19,286.87/158.87
  6. Step 6: Final answer
    x = 121.40

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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.