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Finding the Fourth Proportional to 161.71, 242.21 and 113.20

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Solution

The fourth proportional to 161.71, 242.21 and 113.20 is: 169.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.71 : 242.21 = 113.20 : x
  2. Step 2: Convert to fraction form
    161.71/242.21 = 113.20/x
  3. Step 3: Cross multiply
    161.71x = 242.21 × 113.20
  4. Step 4: Simplify right side
    161.71x = 27,417.85
  5. Step 5: Solve for x
    x = 27,417.85/161.71
  6. Step 6: Final answer
    x = 169.55

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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.