Home / 3,078.28-4,617.39-769.78

Finding the Fourth Proportional to 3,078.28, 4,617.39 and 769.78

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Solution

The fourth proportional to 3,078.28, 4,617.39 and 769.78 is: 1,154.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,078.28 : 4,617.39 = 769.78 : x
  2. Step 2: Convert to fraction form
    3,078.28/4,617.39 = 769.78/x
  3. Step 3: Cross multiply
    3,078.28x = 4,617.39 × 769.78
  4. Step 4: Simplify right side
    3,078.28x = 3,554,374.47
  5. Step 5: Solve for x
    x = 3,554,374.47/3,078.28
  6. Step 6: Final answer
    x = 1,154.66

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1.5x scale

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.