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Finding the Fourth Proportional to 153.61, 230.18 and 81.37

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Solution

The fourth proportional to 153.61, 230.18 and 81.37 is: 121.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.61 : 230.18 = 81.37 : x
  2. Step 2: Convert to fraction form
    153.61/230.18 = 81.37/x
  3. Step 3: Cross multiply
    153.61x = 230.18 × 81.37
  4. Step 4: Simplify right side
    153.61x = 18,729.34
  5. Step 5: Solve for x
    x = 18,729.34/153.61
  6. Step 6: Final answer
    x = 121.93

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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.