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Finding the Fourth Proportional to 512.79, 769.11 and 426.66

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Solution

The fourth proportional to 512.79, 769.11 and 426.66 is: 639.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.79 : 769.11 = 426.66 : x
  2. Step 2: Convert to fraction form
    512.79/769.11 = 426.66/x
  3. Step 3: Cross multiply
    512.79x = 769.11 × 426.66
  4. Step 4: Simplify right side
    512.79x = 328,148.47
  5. Step 5: Solve for x
    x = 328,148.47/512.79
  6. Step 6: Final answer
    x = 639.93

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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.