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Finding the Fourth Proportional to 8,638.78, 12,960.06 and 2,795.44

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Solution

The fourth proportional to 8,638.78, 12,960.06 and 2,795.44 is: 4,193.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,638.78 : 12,960.06 = 2,795.44 : x
  2. Step 2: Convert to fraction form
    8,638.78/12,960.06 = 2,795.44/x
  3. Step 3: Cross multiply
    8,638.78x = 12,960.06 × 2,795.44
  4. Step 4: Simplify right side
    8,638.78x = 36,229,070.13
  5. Step 5: Solve for x
    x = 36,229,070.13/8,638.78
  6. Step 6: Final answer
    x = 4,193.77

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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.