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Finding the Fourth Proportional to 121.44, 167.52 and 90.28

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Solution

The fourth proportional to 121.44, 167.52 and 90.28 is: 124.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.44 : 167.52 = 90.28 : x
  2. Step 2: Convert to fraction form
    121.44/167.52 = 90.28/x
  3. Step 3: Cross multiply
    121.44x = 167.52 × 90.28
  4. Step 4: Simplify right side
    121.44x = 15,123.71
  5. Step 5: Solve for x
    x = 15,123.71/121.44
  6. Step 6: Final answer
    x = 124.54

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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.