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Finding the Fourth Proportional to 121.48, 182.21 and 87.25

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Solution

The fourth proportional to 121.48, 182.21 and 87.25 is: 130.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.48 : 182.21 = 87.25 : x
  2. Step 2: Convert to fraction form
    121.48/182.21 = 87.25/x
  3. Step 3: Cross multiply
    121.48x = 182.21 × 87.25
  4. Step 4: Simplify right side
    121.48x = 15,897.82
  5. Step 5: Solve for x
    x = 15,897.82/121.48
  6. Step 6: Final answer
    x = 130.87

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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.