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Finding the Fourth Proportional to 512.67, 769.14 and 147.47

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Solution

The fourth proportional to 512.67, 769.14 and 147.47 is: 221.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.67 : 769.14 = 147.47 : x
  2. Step 2: Convert to fraction form
    512.67/769.14 = 147.47/x
  3. Step 3: Cross multiply
    512.67x = 769.14 × 147.47
  4. Step 4: Simplify right side
    512.67x = 113,421.23
  5. Step 5: Solve for x
    x = 113,421.23/512.67
  6. Step 6: Final answer
    x = 221.23

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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.