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Finding the Fourth Proportional to 8,587.20, 11,850.78 and 4,811.21

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Solution

The fourth proportional to 8,587.20, 11,850.78 and 4,811.21 is: 6,639.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,587.20 : 11,850.78 = 4,811.21 : x
  2. Step 2: Convert to fraction form
    8,587.20/11,850.78 = 4,811.21/x
  3. Step 3: Cross multiply
    8,587.20x = 11,850.78 × 4,811.21
  4. Step 4: Simplify right side
    8,587.20x = 57,016,507.93
  5. Step 5: Solve for x
    x = 57,016,507.93/8,587.20
  6. Step 6: Final answer
    x = 6,639.71

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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.