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Finding the Fourth Proportional to 121.46, 181.92 and 87.26

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Solution

The fourth proportional to 121.46, 181.92 and 87.26 is: 130.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.46 : 181.92 = 87.26 : x
  2. Step 2: Convert to fraction form
    121.46/181.92 = 87.26/x
  3. Step 3: Cross multiply
    121.46x = 181.92 × 87.26
  4. Step 4: Simplify right side
    121.46x = 15,874.34
  5. Step 5: Solve for x
    x = 15,874.34/121.46
  6. Step 6: Final answer
    x = 130.70

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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.