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Finding the Fourth Proportional to 759.98, 1,139.39 and 394.53

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Solution

The fourth proportional to 759.98, 1,139.39 and 394.53 is: 591.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.98 : 1,139.39 = 394.53 : x
  2. Step 2: Convert to fraction form
    759.98/1,139.39 = 394.53/x
  3. Step 3: Cross multiply
    759.98x = 1,139.39 × 394.53
  4. Step 4: Simplify right side
    759.98x = 449,523.54
  5. Step 5: Solve for x
    x = 449,523.54/759.98
  6. Step 6: Final answer
    x = 591.49

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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.