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Finding the Fourth Proportional to 161.35, 242.09 and 89.12

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Solution

The fourth proportional to 161.35, 242.09 and 89.12 is: 133.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.35 : 242.09 = 89.12 : x
  2. Step 2: Convert to fraction form
    161.35/242.09 = 89.12/x
  3. Step 3: Cross multiply
    161.35x = 242.09 × 89.12
  4. Step 4: Simplify right side
    161.35x = 21,575.55
  5. Step 5: Solve for x
    x = 21,575.55/161.35
  6. Step 6: Final answer
    x = 133.72

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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.