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Finding the Fourth Proportional to 759.92, 1,139.69 and 394.50

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Solution

The fourth proportional to 759.92, 1,139.69 and 394.50 is: 591.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.92 : 1,139.69 = 394.50 : x
  2. Step 2: Convert to fraction form
    759.92/1,139.69 = 394.50/x
  3. Step 3: Cross multiply
    759.92x = 1,139.69 × 394.50
  4. Step 4: Simplify right side
    759.92x = 449,605.73
  5. Step 5: Solve for x
    x = 449,605.73/759.92
  6. Step 6: Final answer
    x = 591.65

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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.