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Finding the Fourth Proportional to 121.76, 168.03 and 66.50

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Solution

The fourth proportional to 121.76, 168.03 and 66.50 is: 91.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.76 : 168.03 = 66.50 : x
  2. Step 2: Convert to fraction form
    121.76/168.03 = 66.50/x
  3. Step 3: Cross multiply
    121.76x = 168.03 × 66.50
  4. Step 4: Simplify right side
    121.76x = 11,172.82
  5. Step 5: Solve for x
    x = 11,172.82/121.76
  6. Step 6: Final answer
    x = 91.76

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.