Home / 8,785.16-12,121.42-5,645.64

Finding the Fourth Proportional to 8,785.16, 12,121.42 and 5,645.64

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Solution

The fourth proportional to 8,785.16, 12,121.42 and 5,645.64 is: 7,789.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,785.16 : 12,121.42 = 5,645.64 : x
  2. Step 2: Convert to fraction form
    8,785.16/12,121.42 = 5,645.64/x
  3. Step 3: Cross multiply
    8,785.16x = 12,121.42 × 5,645.64
  4. Step 4: Simplify right side
    8,785.16x = 68,433,173.61
  5. Step 5: Solve for x
    x = 68,433,173.61/8,785.16
  6. Step 6: Final answer
    x = 7,789.63

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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.