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Finding the Fourth Proportional to 157.61, 217.38 and 124.81

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Solution

The fourth proportional to 157.61, 217.38 and 124.81 is: 172.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.61 : 217.38 = 124.81 : x
  2. Step 2: Convert to fraction form
    157.61/217.38 = 124.81/x
  3. Step 3: Cross multiply
    157.61x = 217.38 × 124.81
  4. Step 4: Simplify right side
    157.61x = 27,131.20
  5. Step 5: Solve for x
    x = 27,131.20/157.61
  6. Step 6: Final answer
    x = 172.14

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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.