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Finding the Fourth Proportional to 8,378.79, 12,567.92 and 2,138.78

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Solution

The fourth proportional to 8,378.79, 12,567.92 and 2,138.78 is: 3,208.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,378.79 : 12,567.92 = 2,138.78 : x
  2. Step 2: Convert to fraction form
    8,378.79/12,567.92 = 2,138.78/x
  3. Step 3: Cross multiply
    8,378.79x = 12,567.92 × 2,138.78
  4. Step 4: Simplify right side
    8,378.79x = 26,880,007.33
  5. Step 5: Solve for x
    x = 26,880,007.33/8,378.79
  6. Step 6: Final answer
    x = 3,208.10

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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.