Home / 8,920.91-12,309.60-5,143.78

Finding the Fourth Proportional to 8,920.91, 12,309.60 and 5,143.78

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Solution

The fourth proportional to 8,920.91, 12,309.60 and 5,143.78 is: 7,097.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,920.91 : 12,309.60 = 5,143.78 : x
  2. Step 2: Convert to fraction form
    8,920.91/12,309.60 = 5,143.78/x
  3. Step 3: Cross multiply
    8,920.91x = 12,309.60 × 5,143.78
  4. Step 4: Simplify right side
    8,920.91x = 63,317,874.29
  5. Step 5: Solve for x
    x = 63,317,874.29/8,920.91
  6. Step 6: Final answer
    x = 7,097.69

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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.