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Finding the Fourth Proportional to 676.78, 932.58 and 519.40

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Solution

The fourth proportional to 676.78, 932.58 and 519.40 is: 715.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.78 : 932.58 = 519.40 : x
  2. Step 2: Convert to fraction form
    676.78/932.58 = 519.40/x
  3. Step 3: Cross multiply
    676.78x = 932.58 × 519.40
  4. Step 4: Simplify right side
    676.78x = 484,382.05
  5. Step 5: Solve for x
    x = 484,382.05/676.78
  6. Step 6: Final answer
    x = 715.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.