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Finding the Fourth Proportional to 157.37, 217.17 and 87.43

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Solution

The fourth proportional to 157.37, 217.17 and 87.43 is: 120.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.37 : 217.17 = 87.43 : x
  2. Step 2: Convert to fraction form
    157.37/217.17 = 87.43/x
  3. Step 3: Cross multiply
    157.37x = 217.17 × 87.43
  4. Step 4: Simplify right side
    157.37x = 18,988.02
  5. Step 5: Solve for x
    x = 18,988.02/157.37
  6. Step 6: Final answer
    x = 120.66

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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.