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Finding the Fourth Proportional to 153.16, 229.80 and 81

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Solution

The fourth proportional to 153.16, 229.80 and 81 is: 121.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.16 : 229.80 = 81 : x
  2. Step 2: Convert to fraction form
    153.16/229.80 = 81/x
  3. Step 3: Cross multiply
    153.16x = 229.80 × 81
  4. Step 4: Simplify right side
    153.16x = 18,614.10
  5. Step 5: Solve for x
    x = 18,614.10/153.16
  6. Step 6: Final answer
    x = 121.54

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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.