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Finding the Fourth Proportional to 765.55, 1,148.31 and 518.87

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Solution

The fourth proportional to 765.55, 1,148.31 and 518.87 is: 778.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.55 : 1,148.31 = 518.87 : x
  2. Step 2: Convert to fraction form
    765.55/1,148.31 = 518.87/x
  3. Step 3: Cross multiply
    765.55x = 1,148.31 × 518.87
  4. Step 4: Simplify right side
    765.55x = 595,823.61
  5. Step 5: Solve for x
    x = 595,823.61/765.55
  6. Step 6: Final answer
    x = 778.29

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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.