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Finding the Fourth Proportional to 2,569.86, 3,854.79 and 721.17

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Solution

The fourth proportional to 2,569.86, 3,854.79 and 721.17 is: 1,081.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,569.86 : 3,854.79 = 721.17 : x
  2. Step 2: Convert to fraction form
    2,569.86/3,854.79 = 721.17/x
  3. Step 3: Cross multiply
    2,569.86x = 3,854.79 × 721.17
  4. Step 4: Simplify right side
    2,569.86x = 2,779,958.90
  5. Step 5: Solve for x
    x = 2,779,958.90/2,569.86
  6. Step 6: Final answer
    x = 1,081.76

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Similar ratio
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1.5x scale

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.