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Finding the Fourth Proportional to 8,687.88, 11,979.77 and 6,453.90

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Solution

The fourth proportional to 8,687.88, 11,979.77 and 6,453.90 is: 8,899.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,687.88 : 11,979.77 = 6,453.90 : x
  2. Step 2: Convert to fraction form
    8,687.88/11,979.77 = 6,453.90/x
  3. Step 3: Cross multiply
    8,687.88x = 11,979.77 × 6,453.90
  4. Step 4: Simplify right side
    8,687.88x = 77,316,205.33
  5. Step 5: Solve for x
    x = 77,316,205.33/8,687.88
  6. Step 6: Final answer
    x = 8,899.32

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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.