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Finding the Fourth Proportional to 8,139.89, 11,226.89 and 5,909.15

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Solution

The fourth proportional to 8,139.89, 11,226.89 and 5,909.15 is: 8,150.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,139.89 : 11,226.89 = 5,909.15 : x
  2. Step 2: Convert to fraction form
    8,139.89/11,226.89 = 5,909.15/x
  3. Step 3: Cross multiply
    8,139.89x = 11,226.89 × 5,909.15
  4. Step 4: Simplify right side
    8,139.89x = 66,341,291.36
  5. Step 5: Solve for x
    x = 66,341,291.36/8,139.89
  6. Step 6: Final answer
    x = 8,150.15

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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.