Home / 1,387.90-2,079.73-1,169.20

Finding the Fourth Proportional to 1,387.90, 2,079.73 and 1,169.20

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Solution

The fourth proportional to 1,387.90, 2,079.73 and 1,169.20 is: 1,752.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.90 : 2,079.73 = 1,169.20 : x
  2. Step 2: Convert to fraction form
    1,387.90/2,079.73 = 1,169.20/x
  3. Step 3: Cross multiply
    1,387.90x = 2,079.73 × 1,169.20
  4. Step 4: Simplify right side
    1,387.90x = 2,431,620.32
  5. Step 5: Solve for x
    x = 2,431,620.32/1,387.90
  6. Step 6: Final answer
    x = 1,752.01

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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.