Home / 8,720.91-13,081.25-2,147.15

Finding the Fourth Proportional to 8,720.91, 13,081.25 and 2,147.15

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Solution

The fourth proportional to 8,720.91, 13,081.25 and 2,147.15 is: 3,220.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,720.91 : 13,081.25 = 2,147.15 : x
  2. Step 2: Convert to fraction form
    8,720.91/13,081.25 = 2,147.15/x
  3. Step 3: Cross multiply
    8,720.91x = 13,081.25 × 2,147.15
  4. Step 4: Simplify right side
    8,720.91x = 28,087,444.01
  5. Step 5: Solve for x
    x = 28,087,444.01/8,720.91
  6. Step 6: Final answer
    x = 3,220.70

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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.