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Finding the Fourth Proportional to 342.79, 513.74 and 147.56

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Solution

The fourth proportional to 342.79, 513.74 and 147.56 is: 221.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.79 : 513.74 = 147.56 : x
  2. Step 2: Convert to fraction form
    342.79/513.74 = 147.56/x
  3. Step 3: Cross multiply
    342.79x = 513.74 × 147.56
  4. Step 4: Simplify right side
    342.79x = 75,805.27
  5. Step 5: Solve for x
    x = 75,805.27/342.79
  6. Step 6: Final answer
    x = 221.14

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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.