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Finding the Fourth Proportional to 121.48, 167.56 and 93.80

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Solution

The fourth proportional to 121.48, 167.56 and 93.80 is: 129.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.48 : 167.56 = 93.80 : x
  2. Step 2: Convert to fraction form
    121.48/167.56 = 93.80/x
  3. Step 3: Cross multiply
    121.48x = 167.56 × 93.80
  4. Step 4: Simplify right side
    121.48x = 15,717.06
  5. Step 5: Solve for x
    x = 15,717.06/121.48
  6. Step 6: Final answer
    x = 129.38

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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.