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Finding the Fourth Proportional to 759.97, 1,139.58 and 394.66

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Solution

The fourth proportional to 759.97, 1,139.58 and 394.66 is: 591.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.97 : 1,139.58 = 394.66 : x
  2. Step 2: Convert to fraction form
    759.97/1,139.58 = 394.66/x
  3. Step 3: Cross multiply
    759.97x = 1,139.58 × 394.66
  4. Step 4: Simplify right side
    759.97x = 449,746.64
  5. Step 5: Solve for x
    x = 449,746.64/759.97
  6. Step 6: Final answer
    x = 591.80

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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.