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Finding the Fourth Proportional to 161.72, 243.87 and 157.72

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Solution

The fourth proportional to 161.72, 243.87 and 157.72 is: 237.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.72 : 243.87 = 157.72 : x
  2. Step 2: Convert to fraction form
    161.72/243.87 = 157.72/x
  3. Step 3: Cross multiply
    161.72x = 243.87 × 157.72
  4. Step 4: Simplify right side
    161.72x = 38,463.18
  5. Step 5: Solve for x
    x = 38,463.18/161.72
  6. Step 6: Final answer
    x = 237.84

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.