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Finding the Fourth Proportional to 121.25, 167.18 and 88.58

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Solution

The fourth proportional to 121.25, 167.18 and 88.58 is: 122.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.25 : 167.18 = 88.58 : x
  2. Step 2: Convert to fraction form
    121.25/167.18 = 88.58/x
  3. Step 3: Cross multiply
    121.25x = 167.18 × 88.58
  4. Step 4: Simplify right side
    121.25x = 14,807.53
  5. Step 5: Solve for x
    x = 14,807.53/121.25
  6. Step 6: Final answer
    x = 122.13

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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.