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Finding the Fourth Proportional to 121.95, 168.30 and 69.48

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Solution

The fourth proportional to 121.95, 168.30 and 69.48 is: 95.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.95 : 168.30 = 69.48 : x
  2. Step 2: Convert to fraction form
    121.95/168.30 = 69.48/x
  3. Step 3: Cross multiply
    121.95x = 168.30 × 69.48
  4. Step 4: Simplify right side
    121.95x = 11,693.48
  5. Step 5: Solve for x
    x = 11,693.48/121.95
  6. Step 6: Final answer
    x = 95.89

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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.