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Finding the Fourth Proportional to 512.91, 769.40 and 391.92

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Solution

The fourth proportional to 512.91, 769.40 and 391.92 is: 587.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.91 : 769.40 = 391.92 : x
  2. Step 2: Convert to fraction form
    512.91/769.40 = 391.92/x
  3. Step 3: Cross multiply
    512.91x = 769.40 × 391.92
  4. Step 4: Simplify right side
    512.91x = 301,543.25
  5. Step 5: Solve for x
    x = 301,543.25/512.91
  6. Step 6: Final answer
    x = 587.91

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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.