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Finding the Fourth Proportional to 153.41, 230.18 and 81.25

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Solution

The fourth proportional to 153.41, 230.18 and 81.25 is: 121.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.41 : 230.18 = 81.25 : x
  2. Step 2: Convert to fraction form
    153.41/230.18 = 81.25/x
  3. Step 3: Cross multiply
    153.41x = 230.18 × 81.25
  4. Step 4: Simplify right side
    153.41x = 18,702.13
  5. Step 5: Solve for x
    x = 18,702.13/153.41
  6. Step 6: Final answer
    x = 121.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.