Home / 2,080.14-3,120.36-781.62

Finding the Fourth Proportional to 2,080.14, 3,120.36 and 781.62

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Solution

The fourth proportional to 2,080.14, 3,120.36 and 781.62 is: 1,172.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,080.14 : 3,120.36 = 781.62 : x
  2. Step 2: Convert to fraction form
    2,080.14/3,120.36 = 781.62/x
  3. Step 3: Cross multiply
    2,080.14x = 3,120.36 × 781.62
  4. Step 4: Simplify right side
    2,080.14x = 2,438,935.78
  5. Step 5: Solve for x
    x = 2,438,935.78/2,080.14
  6. Step 6: Final answer
    x = 1,172.49

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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.