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Finding the Fourth Proportional to 759.50, 1,139.34 and 394.10

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Solution

The fourth proportional to 759.50, 1,139.34 and 394.10 is: 591.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.50 : 1,139.34 = 394.10 : x
  2. Step 2: Convert to fraction form
    759.50/1,139.34 = 394.10/x
  3. Step 3: Cross multiply
    759.50x = 1,139.34 × 394.10
  4. Step 4: Simplify right side
    759.50x = 449,013.89
  5. Step 5: Solve for x
    x = 449,013.89/759.50
  6. Step 6: Final answer
    x = 591.20

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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.