Home / 1,979.02-2,731.16-1,139.70

Finding the Fourth Proportional to 1,979.02, 2,731.16 and 1,139.70

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Solution

The fourth proportional to 1,979.02, 2,731.16 and 1,139.70 is: 1,572.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,979.02 : 2,731.16 = 1,139.70 : x
  2. Step 2: Convert to fraction form
    1,979.02/2,731.16 = 1,139.70/x
  3. Step 3: Cross multiply
    1,979.02x = 2,731.16 × 1,139.70
  4. Step 4: Simplify right side
    1,979.02x = 3,112,705.90
  5. Step 5: Solve for x
    x = 3,112,705.90/1,979.02
  6. Step 6: Final answer
    x = 1,572.85

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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.