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Finding the Fourth Proportional to 9,979.60, 13,777.86 and 8,872.60

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Solution

The fourth proportional to 9,979.60, 13,777.86 and 8,872.60 is: 12,249.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,979.60 : 13,777.86 = 8,872.60 : x
  2. Step 2: Convert to fraction form
    9,979.60/13,777.86 = 8,872.60/x
  3. Step 3: Cross multiply
    9,979.60x = 13,777.86 × 8,872.60
  4. Step 4: Simplify right side
    9,979.60x = 122,245,440.64
  5. Step 5: Solve for x
    x = 122,245,440.64/9,979.60
  6. Step 6: Final answer
    x = 12,249.53

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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.