Home / 1,387.20-2,080.80-1,154.88

Finding the Fourth Proportional to 1,387.20, 2,080.80 and 1,154.88

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Solution

The fourth proportional to 1,387.20, 2,080.80 and 1,154.88 is: 1,732.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.20 : 2,080.80 = 1,154.88 : x
  2. Step 2: Convert to fraction form
    1,387.20/2,080.80 = 1,154.88/x
  3. Step 3: Cross multiply
    1,387.20x = 2,080.80 × 1,154.88
  4. Step 4: Simplify right side
    1,387.20x = 2,403,074.30
  5. Step 5: Solve for x
    x = 2,403,074.30/1,387.20
  6. Step 6: Final answer
    x = 1,732.32

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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.