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Finding the Fourth Proportional to 9,251.72, 12,768.90 and 8,689.40

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Solution

The fourth proportional to 9,251.72, 12,768.90 and 8,689.40 is: 11,992.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,251.72 : 12,768.90 = 8,689.40 : x
  2. Step 2: Convert to fraction form
    9,251.72/12,768.90 = 8,689.40/x
  3. Step 3: Cross multiply
    9,251.72x = 12,768.90 × 8,689.40
  4. Step 4: Simplify right side
    9,251.72x = 110,954,079.66
  5. Step 5: Solve for x
    x = 110,954,079.66/9,251.72
  6. Step 6: Final answer
    x = 11,992.81

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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.