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Finding the Fourth Proportional to 157.88, 217.89 and 87.95

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Solution

The fourth proportional to 157.88, 217.89 and 87.95 is: 121.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.88 : 217.89 = 87.95 : x
  2. Step 2: Convert to fraction form
    157.88/217.89 = 87.95/x
  3. Step 3: Cross multiply
    157.88x = 217.89 × 87.95
  4. Step 4: Simplify right side
    157.88x = 19,163.43
  5. Step 5: Solve for x
    x = 19,163.43/157.88
  6. Step 6: Final answer
    x = 121.38

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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.