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Finding the Fourth Proportional to 121.70, 182.21 and 87.27

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Solution

The fourth proportional to 121.70, 182.21 and 87.27 is: 130.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.70 : 182.21 = 87.27 : x
  2. Step 2: Convert to fraction form
    121.70/182.21 = 87.27/x
  3. Step 3: Cross multiply
    121.70x = 182.21 × 87.27
  4. Step 4: Simplify right side
    121.70x = 15,901.03
  5. Step 5: Solve for x
    x = 15,901.03/121.70
  6. Step 6: Final answer
    x = 130.66

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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.