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Finding the Fourth Proportional to 759.20, 1,139.07 and 393.98

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Solution

The fourth proportional to 759.20, 1,139.07 and 393.98 is: 591.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.20 : 1,139.07 = 393.98 : x
  2. Step 2: Convert to fraction form
    759.20/1,139.07 = 393.98/x
  3. Step 3: Cross multiply
    759.20x = 1,139.07 × 393.98
  4. Step 4: Simplify right side
    759.20x = 448,770.80
  5. Step 5: Solve for x
    x = 448,770.80/759.20
  6. Step 6: Final answer
    x = 591.11

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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.