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Finding the Fourth Proportional to 161.43, 242.28 and 74.81

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Solution

The fourth proportional to 161.43, 242.28 and 74.81 is: 112.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.43 : 242.28 = 74.81 : x
  2. Step 2: Convert to fraction form
    161.43/242.28 = 74.81/x
  3. Step 3: Cross multiply
    161.43x = 242.28 × 74.81
  4. Step 4: Simplify right side
    161.43x = 18,124.97
  5. Step 5: Solve for x
    x = 18,124.97/161.43
  6. Step 6: Final answer
    x = 112.28

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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.