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Finding the Fourth Proportional to 759.53, 1,139.30 and 515.45

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Solution

The fourth proportional to 759.53, 1,139.30 and 515.45 is: 773.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.53 : 1,139.30 = 515.45 : x
  2. Step 2: Convert to fraction form
    759.53/1,139.30 = 515.45/x
  3. Step 3: Cross multiply
    759.53x = 1,139.30 × 515.45
  4. Step 4: Simplify right side
    759.53x = 587,252.19
  5. Step 5: Solve for x
    x = 587,252.19/759.53
  6. Step 6: Final answer
    x = 773.18

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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.