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Finding the Fourth Proportional to 8,728.85, 12,029.39 and 7,869.25

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Solution

The fourth proportional to 8,728.85, 12,029.39 and 7,869.25 is: 10,844.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,728.85 : 12,029.39 = 7,869.25 : x
  2. Step 2: Convert to fraction form
    8,728.85/12,029.39 = 7,869.25/x
  3. Step 3: Cross multiply
    8,728.85x = 12,029.39 × 7,869.25
  4. Step 4: Simplify right side
    8,728.85x = 94,662,260.33
  5. Step 5: Solve for x
    x = 94,662,260.33/8,728.85
  6. Step 6: Final answer
    x = 10,844.76

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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.