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Finding the Fourth Proportional to 121.53, 167.95 and 90.54

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Solution

The fourth proportional to 121.53, 167.95 and 90.54 is: 125.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.53 : 167.95 = 90.54 : x
  2. Step 2: Convert to fraction form
    121.53/167.95 = 90.54/x
  3. Step 3: Cross multiply
    121.53x = 167.95 × 90.54
  4. Step 4: Simplify right side
    121.53x = 15,206.39
  5. Step 5: Solve for x
    x = 15,206.39/121.53
  6. Step 6: Final answer
    x = 125.13

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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.