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Finding the Fourth Proportional to 7,891.50, 10,885.67 and 5,057.86

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Solution

The fourth proportional to 7,891.50, 10,885.67 and 5,057.86 is: 6,976.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,891.50 : 10,885.67 = 5,057.86 : x
  2. Step 2: Convert to fraction form
    7,891.50/10,885.67 = 5,057.86/x
  3. Step 3: Cross multiply
    7,891.50x = 10,885.67 × 5,057.86
  4. Step 4: Simplify right side
    7,891.50x = 55,058,194.87
  5. Step 5: Solve for x
    x = 55,058,194.87/7,891.50
  6. Step 6: Final answer
    x = 6,976.90

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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.