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Finding the Fourth Proportional to 759.20, 1,139.71 and 514.99

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Solution

The fourth proportional to 759.20, 1,139.71 and 514.99 is: 773.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.20 : 1,139.71 = 514.99 : x
  2. Step 2: Convert to fraction form
    759.20/1,139.71 = 514.99/x
  3. Step 3: Cross multiply
    759.20x = 1,139.71 × 514.99
  4. Step 4: Simplify right side
    759.20x = 586,933.55
  5. Step 5: Solve for x
    x = 586,933.55/759.20
  6. Step 6: Final answer
    x = 773.09

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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.