Home / 1,979.78-2,972.10-1,158.44

Finding the Fourth Proportional to 1,979.78, 2,972.10 and 1,158.44

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Solution

The fourth proportional to 1,979.78, 2,972.10 and 1,158.44 is: 1,739.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.78 : 2,972.10 = 1,158.44 : x
  2. Step 2: Convert to fraction form
    1,979.78/2,972.10 = 1,158.44/x
  3. Step 3: Cross multiply
    1,979.78x = 2,972.10 × 1,158.44
  4. Step 4: Simplify right side
    1,979.78x = 3,442,999.52
  5. Step 5: Solve for x
    x = 3,442,999.52/1,979.78
  6. Step 6: Final answer
    x = 1,739.08

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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.