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Finding the Fourth Proportional to 157.67, 236.72 and 99.72

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Solution

The fourth proportional to 157.67, 236.72 and 99.72 is: 149.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.67 : 236.72 = 99.72 : x
  2. Step 2: Convert to fraction form
    157.67/236.72 = 99.72/x
  3. Step 3: Cross multiply
    157.67x = 236.72 × 99.72
  4. Step 4: Simplify right side
    157.67x = 23,605.97
  5. Step 5: Solve for x
    x = 23,605.97/157.67
  6. Step 6: Final answer
    x = 149.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.