Home / 8,785.52-12,120.36-5,640.56

Finding the Fourth Proportional to 8,785.52, 12,120.36 and 5,640.56

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Solution

The fourth proportional to 8,785.52, 12,120.36 and 5,640.56 is: 7,781.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,785.52 : 12,120.36 = 5,640.56 : x
  2. Step 2: Convert to fraction form
    8,785.52/12,120.36 = 5,640.56/x
  3. Step 3: Cross multiply
    8,785.52x = 12,120.36 × 5,640.56
  4. Step 4: Simplify right side
    8,785.52x = 68,365,617.80
  5. Step 5: Solve for x
    x = 68,365,617.80/8,785.52
  6. Step 6: Final answer
    x = 7,781.62

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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.