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Finding the Fourth Proportional to 157.59, 217.50 and 99.38

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Solution

The fourth proportional to 157.59, 217.50 and 99.38 is: 137.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.59 : 217.50 = 99.38 : x
  2. Step 2: Convert to fraction form
    157.59/217.50 = 99.38/x
  3. Step 3: Cross multiply
    157.59x = 217.50 × 99.38
  4. Step 4: Simplify right side
    157.59x = 21,614.06
  5. Step 5: Solve for x
    x = 21,614.06/157.59
  6. Step 6: Final answer
    x = 137.15

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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.