Home / 2,891.28-3,989.98-1,565

Finding the Fourth Proportional to 2,891.28, 3,989.98 and 1,565

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Solution

The fourth proportional to 2,891.28, 3,989.98 and 1,565 is: 2,159.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,891.28 : 3,989.98 = 1,565 : x
  2. Step 2: Convert to fraction form
    2,891.28/3,989.98 = 1,565/x
  3. Step 3: Cross multiply
    2,891.28x = 3,989.98 × 1,565
  4. Step 4: Simplify right side
    2,891.28x = 6,244,318.70
  5. Step 5: Solve for x
    x = 6,244,318.70/2,891.28
  6. Step 6: Final answer
    x = 2,159.71

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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.