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Finding the Fourth Proportional to 778.79, 1,074.71 and 517.29

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Solution

The fourth proportional to 778.79, 1,074.71 and 517.29 is: 713.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.79 : 1,074.71 = 517.29 : x
  2. Step 2: Convert to fraction form
    778.79/1,074.71 = 517.29/x
  3. Step 3: Cross multiply
    778.79x = 1,074.71 × 517.29
  4. Step 4: Simplify right side
    778.79x = 555,934.15
  5. Step 5: Solve for x
    x = 555,934.15/778.79
  6. Step 6: Final answer
    x = 713.85

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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.