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Finding the Fourth Proportional to 8,917.88, 12,306.67 and 5,191.88

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Solution

The fourth proportional to 8,917.88, 12,306.67 and 5,191.88 is: 7,164.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,917.88 : 12,306.67 = 5,191.88 : x
  2. Step 2: Convert to fraction form
    8,917.88/12,306.67 = 5,191.88/x
  3. Step 3: Cross multiply
    8,917.88x = 12,306.67 × 5,191.88
  4. Step 4: Simplify right side
    8,917.88x = 63,894,679.33
  5. Step 5: Solve for x
    x = 63,894,679.33/8,917.88
  6. Step 6: Final answer
    x = 7,164.79

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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.