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Finding the Fourth Proportional to 759.86, 1,139.81 and 394.45

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Solution

The fourth proportional to 759.86, 1,139.81 and 394.45 is: 591.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.86 : 1,139.81 = 394.45 : x
  2. Step 2: Convert to fraction form
    759.86/1,139.81 = 394.45/x
  3. Step 3: Cross multiply
    759.86x = 1,139.81 × 394.45
  4. Step 4: Simplify right side
    759.86x = 449,593.23
  5. Step 5: Solve for x
    x = 449,593.23/759.86
  6. Step 6: Final answer
    x = 591.68

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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.