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Finding the Fourth Proportional to 6,279.64, 8,663.70 and 3,920.92

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Solution

The fourth proportional to 6,279.64, 8,663.70 and 3,920.92 is: 5,409.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,279.64 : 8,663.70 = 3,920.92 : x
  2. Step 2: Convert to fraction form
    6,279.64/8,663.70 = 3,920.92/x
  3. Step 3: Cross multiply
    6,279.64x = 8,663.70 × 3,920.92
  4. Step 4: Simplify right side
    6,279.64x = 33,969,674.60
  5. Step 5: Solve for x
    x = 33,969,674.60/6,279.64
  6. Step 6: Final answer
    x = 5,409.49

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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.