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Finding the Fourth Proportional to 342.56, 513.84 and 147.71

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Solution

The fourth proportional to 342.56, 513.84 and 147.71 is: 221.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.56 : 513.84 = 147.71 : x
  2. Step 2: Convert to fraction form
    342.56/513.84 = 147.71/x
  3. Step 3: Cross multiply
    342.56x = 513.84 × 147.71
  4. Step 4: Simplify right side
    342.56x = 75,898.25
  5. Step 5: Solve for x
    x = 75,898.25/342.56
  6. Step 6: Final answer
    x = 221.56

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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.