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Finding the Fourth Proportional to 1,388.97, 2,080.71 and 1,079.13

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Solution

The fourth proportional to 1,388.97, 2,080.71 and 1,079.13 is: 1,616.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388.97 : 2,080.71 = 1,079.13 : x
  2. Step 2: Convert to fraction form
    1,388.97/2,080.71 = 1,079.13/x
  3. Step 3: Cross multiply
    1,388.97x = 2,080.71 × 1,079.13
  4. Step 4: Simplify right side
    1,388.97x = 2,245,356.58
  5. Step 5: Solve for x
    x = 2,245,356.58/1,388.97
  6. Step 6: Final answer
    x = 1,616.56

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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.