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Finding the Fourth Proportional to 8,642.88, 11,932.80 and 6,290.88

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Solution

The fourth proportional to 8,642.88, 11,932.80 and 6,290.88 is: 8,685.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,642.88 : 11,932.80 = 6,290.88 : x
  2. Step 2: Convert to fraction form
    8,642.88/11,932.80 = 6,290.88/x
  3. Step 3: Cross multiply
    8,642.88x = 11,932.80 × 6,290.88
  4. Step 4: Simplify right side
    8,642.88x = 75,067,812.86
  5. Step 5: Solve for x
    x = 75,067,812.86/8,642.88
  6. Step 6: Final answer
    x = 8,685.51

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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.