Home / 1,979.91-2,972.16-1,158.78

Finding the Fourth Proportional to 1,979.91, 2,972.16 and 1,158.78

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Solution

The fourth proportional to 1,979.91, 2,972.16 and 1,158.78 is: 1,739.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.91 : 2,972.16 = 1,158.78 : x
  2. Step 2: Convert to fraction form
    1,979.91/2,972.16 = 1,158.78/x
  3. Step 3: Cross multiply
    1,979.91x = 2,972.16 × 1,158.78
  4. Step 4: Simplify right side
    1,979.91x = 3,444,079.56
  5. Step 5: Solve for x
    x = 3,444,079.56/1,979.91
  6. Step 6: Final answer
    x = 1,739.51

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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.