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Finding the Fourth Proportional to 8,380.62, 12,570.59 and 2,140.79

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Solution

The fourth proportional to 8,380.62, 12,570.59 and 2,140.79 is: 3,211.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,380.62 : 12,570.59 = 2,140.79 : x
  2. Step 2: Convert to fraction form
    8,380.62/12,570.59 = 2,140.79/x
  3. Step 3: Cross multiply
    8,380.62x = 12,570.59 × 2,140.79
  4. Step 4: Simplify right side
    8,380.62x = 26,910,993.37
  5. Step 5: Solve for x
    x = 26,910,993.37/8,380.62
  6. Step 6: Final answer
    x = 3,211.10

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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.