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Finding the Fourth Proportional to 8,379.45, 12,557.84 and 3,990.87

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Solution

The fourth proportional to 8,379.45, 12,557.84 and 3,990.87 is: 5,980.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,379.45 : 12,557.84 = 3,990.87 : x
  2. Step 2: Convert to fraction form
    8,379.45/12,557.84 = 3,990.87/x
  3. Step 3: Cross multiply
    8,379.45x = 12,557.84 × 3,990.87
  4. Step 4: Simplify right side
    8,379.45x = 50,116,686.97
  5. Step 5: Solve for x
    x = 50,116,686.97/8,379.45
  6. Step 6: Final answer
    x = 5,980.90

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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.