Home / 2,158.80-2,979.36-1,319.88

Finding the Fourth Proportional to 2,158.80, 2,979.36 and 1,319.88

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Solution

The fourth proportional to 2,158.80, 2,979.36 and 1,319.88 is: 1,821.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,158.80 : 2,979.36 = 1,319.88 : x
  2. Step 2: Convert to fraction form
    2,158.80/2,979.36 = 1,319.88/x
  3. Step 3: Cross multiply
    2,158.80x = 2,979.36 × 1,319.88
  4. Step 4: Simplify right side
    2,158.80x = 3,932,397.68
  5. Step 5: Solve for x
    x = 3,932,397.68/2,158.80
  6. Step 6: Final answer
    x = 1,821.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.