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Finding the Fourth Proportional to 153.24, 229.50 and 81

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Solution

The fourth proportional to 153.24, 229.50 and 81 is: 121.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.24 : 229.50 = 81 : x
  2. Step 2: Convert to fraction form
    153.24/229.50 = 81/x
  3. Step 3: Cross multiply
    153.24x = 229.50 × 81
  4. Step 4: Simplify right side
    153.24x = 18,589.50
  5. Step 5: Solve for x
    x = 18,589.50/153.24
  6. Step 6: Final answer
    x = 121.31

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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.