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Finding the Fourth Proportional to 765.87, 1,057.29 and 518.49

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Solution

The fourth proportional to 765.87, 1,057.29 and 518.49 is: 715.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.87 : 1,057.29 = 518.49 : x
  2. Step 2: Convert to fraction form
    765.87/1,057.29 = 518.49/x
  3. Step 3: Cross multiply
    765.87x = 1,057.29 × 518.49
  4. Step 4: Simplify right side
    765.87x = 548,194.29
  5. Step 5: Solve for x
    x = 548,194.29/765.87
  6. Step 6: Final answer
    x = 715.78

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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.