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Finding the Fourth Proportional to 225.42, 311.16 and 147.78

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Solution

The fourth proportional to 225.42, 311.16 and 147.78 is: 203.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.42 : 311.16 = 147.78 : x
  2. Step 2: Convert to fraction form
    225.42/311.16 = 147.78/x
  3. Step 3: Cross multiply
    225.42x = 311.16 × 147.78
  4. Step 4: Simplify right side
    225.42x = 45,983.22
  5. Step 5: Solve for x
    x = 45,983.22/225.42
  6. Step 6: Final answer
    x = 203.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.