Home / 8,778.74-12,122.79-5,640.44

Finding the Fourth Proportional to 8,778.74, 12,122.79 and 5,640.44

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Solution

The fourth proportional to 8,778.74, 12,122.79 and 5,640.44 is: 7,789.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,778.74 : 12,122.79 = 5,640.44 : x
  2. Step 2: Convert to fraction form
    8,778.74/12,122.79 = 5,640.44/x
  3. Step 3: Cross multiply
    8,778.74x = 12,122.79 × 5,640.44
  4. Step 4: Simplify right side
    8,778.74x = 68,377,869.63
  5. Step 5: Solve for x
    x = 68,377,869.63/8,778.74
  6. Step 6: Final answer
    x = 7,789.03

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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.