Home / 15,781.29-21,778.25-8,707.92

Finding the Fourth Proportional to 15,781.29, 21,778.25 and 8,707.92

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Solution

The fourth proportional to 15,781.29, 21,778.25 and 8,707.92 is: 12,016.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,781.29 : 21,778.25 = 8,707.92 : x
  2. Step 2: Convert to fraction form
    15,781.29/21,778.25 = 8,707.92/x
  3. Step 3: Cross multiply
    15,781.29x = 21,778.25 × 8,707.92
  4. Step 4: Simplify right side
    15,781.29x = 189,643,215.20
  5. Step 5: Solve for x
    x = 189,643,215.20/15,781.29
  6. Step 6: Final answer
    x = 12,016.97

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1.5x scale

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.