Home / 3,139.30-4,708.95-830.80

Finding the Fourth Proportional to 3,139.30, 4,708.95 and 830.80

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Solution

The fourth proportional to 3,139.30, 4,708.95 and 830.80 is: 1,246.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139.30 : 4,708.95 = 830.80 : x
  2. Step 2: Convert to fraction form
    3,139.30/4,708.95 = 830.80/x
  3. Step 3: Cross multiply
    3,139.30x = 4,708.95 × 830.80
  4. Step 4: Simplify right side
    3,139.30x = 3,912,195.66
  5. Step 5: Solve for x
    x = 3,912,195.66/3,139.30
  6. Step 6: Final answer
    x = 1,246.20

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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.