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Finding the Fourth Proportional to 512.66, 767.90 and 425.78

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Solution

The fourth proportional to 512.66, 767.90 and 425.78 is: 637.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.66 : 767.90 = 425.78 : x
  2. Step 2: Convert to fraction form
    512.66/767.90 = 425.78/x
  3. Step 3: Cross multiply
    512.66x = 767.90 × 425.78
  4. Step 4: Simplify right side
    512.66x = 326,959.45
  5. Step 5: Solve for x
    x = 326,959.45/512.66
  6. Step 6: Final answer
    x = 637.78

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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.