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Finding the Fourth Proportional to 153.30, 229.80 and 81.09

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Solution

The fourth proportional to 153.30, 229.80 and 81.09 is: 121.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.30 : 229.80 = 81.09 : x
  2. Step 2: Convert to fraction form
    153.30/229.80 = 81.09/x
  3. Step 3: Cross multiply
    153.30x = 229.80 × 81.09
  4. Step 4: Simplify right side
    153.30x = 18,634.48
  5. Step 5: Solve for x
    x = 18,634.48/153.30
  6. Step 6: Final answer
    x = 121.56

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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.