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Finding the Fourth Proportional to 8,638.67, 12,893.88 and 7,447.61

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Solution

The fourth proportional to 8,638.67, 12,893.88 and 7,447.61 is: 11,116.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,638.67 : 12,893.88 = 7,447.61 : x
  2. Step 2: Convert to fraction form
    8,638.67/12,893.88 = 7,447.61/x
  3. Step 3: Cross multiply
    8,638.67x = 12,893.88 × 7,447.61
  4. Step 4: Simplify right side
    8,638.67x = 96,028,589.63
  5. Step 5: Solve for x
    x = 96,028,589.63/8,638.67
  6. Step 6: Final answer
    x = 11,116.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.