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Finding the Fourth Proportional to 161.79, 242.23 and 112.72

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Solution

The fourth proportional to 161.79, 242.23 and 112.72 is: 168.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.79 : 242.23 = 112.72 : x
  2. Step 2: Convert to fraction form
    161.79/242.23 = 112.72/x
  3. Step 3: Cross multiply
    161.79x = 242.23 × 112.72
  4. Step 4: Simplify right side
    161.79x = 27,302.39
  5. Step 5: Solve for x
    x = 27,302.39/161.79
  6. Step 6: Final answer
    x = 168.75

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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.