Home / 2,891.31-3,990-1,565.04

Finding the Fourth Proportional to 2,891.31, 3,990 and 1,565.04

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Solution

The fourth proportional to 2,891.31, 3,990 and 1,565.04 is: 2,159.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,891.31 : 3,990 = 1,565.04 : x
  2. Step 2: Convert to fraction form
    2,891.31/3,990 = 1,565.04/x
  3. Step 3: Cross multiply
    2,891.31x = 3,990 × 1,565.04
  4. Step 4: Simplify right side
    2,891.31x = 6,244,509.60
  5. Step 5: Solve for x
    x = 6,244,509.60/2,891.31
  6. Step 6: Final answer
    x = 2,159.75

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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.