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Finding the Fourth Proportional to 342.12, 512.76 and 147.08

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Solution

The fourth proportional to 342.12, 512.76 and 147.08 is: 220.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.12 : 512.76 = 147.08 : x
  2. Step 2: Convert to fraction form
    342.12/512.76 = 147.08/x
  3. Step 3: Cross multiply
    342.12x = 512.76 × 147.08
  4. Step 4: Simplify right side
    342.12x = 75,416.74
  5. Step 5: Solve for x
    x = 75,416.74/342.12
  6. Step 6: Final answer
    x = 220.44

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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.