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Finding the Fourth Proportional to 161.49, 242.05 and 74.71

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Solution

The fourth proportional to 161.49, 242.05 and 74.71 is: 111.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.49 : 242.05 = 74.71 : x
  2. Step 2: Convert to fraction form
    161.49/242.05 = 74.71/x
  3. Step 3: Cross multiply
    161.49x = 242.05 × 74.71
  4. Step 4: Simplify right side
    161.49x = 18,083.37
  5. Step 5: Solve for x
    x = 18,083.37/161.49
  6. Step 6: Final answer
    x = 111.98

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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.