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Finding the Fourth Proportional to 8,638.60, 12,957.90 and 2,799.28

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Solution

The fourth proportional to 8,638.60, 12,957.90 and 2,799.28 is: 4,198.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,638.60 : 12,957.90 = 2,799.28 : x
  2. Step 2: Convert to fraction form
    8,638.60/12,957.90 = 2,799.28/x
  3. Step 3: Cross multiply
    8,638.60x = 12,957.90 × 2,799.28
  4. Step 4: Simplify right side
    8,638.60x = 36,272,790.31
  5. Step 5: Solve for x
    x = 36,272,790.31/8,638.60
  6. Step 6: Final answer
    x = 4,198.92

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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.