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Finding the Fourth Proportional to 557.26, 769.44 and 515.80

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Solution

The fourth proportional to 557.26, 769.44 and 515.80 is: 712.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.26 : 769.44 = 515.80 : x
  2. Step 2: Convert to fraction form
    557.26/769.44 = 515.80/x
  3. Step 3: Cross multiply
    557.26x = 769.44 × 515.80
  4. Step 4: Simplify right side
    557.26x = 396,877.15
  5. Step 5: Solve for x
    x = 396,877.15/557.26
  6. Step 6: Final answer
    x = 712.19

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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.