Home / 2,080.10-3,121.35-781.70

Finding the Fourth Proportional to 2,080.10, 3,121.35 and 781.70

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Solution

The fourth proportional to 2,080.10, 3,121.35 and 781.70 is: 1,173.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,080.10 : 3,121.35 = 781.70 : x
  2. Step 2: Convert to fraction form
    2,080.10/3,121.35 = 781.70/x
  3. Step 3: Cross multiply
    2,080.10x = 3,121.35 × 781.70
  4. Step 4: Simplify right side
    2,080.10x = 2,439,959.30
  5. Step 5: Solve for x
    x = 2,439,959.30/2,080.10
  6. Step 6: Final answer
    x = 1,173.00

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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.