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Finding the Fourth Proportional to 7,800.68, 11,691.10 and 3,899.88

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Solution

The fourth proportional to 7,800.68, 11,691.10 and 3,899.88 is: 5,844.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,800.68 : 11,691.10 = 3,899.88 : x
  2. Step 2: Convert to fraction form
    7,800.68/11,691.10 = 3,899.88/x
  3. Step 3: Cross multiply
    7,800.68x = 11,691.10 × 3,899.88
  4. Step 4: Simplify right side
    7,800.68x = 45,593,887.07
  5. Step 5: Solve for x
    x = 45,593,887.07/7,800.68
  6. Step 6: Final answer
    x = 5,844.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.