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Finding the Fourth Proportional to 8,486.72, 12,730.88 and 2,641.92

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Solution

The fourth proportional to 8,486.72, 12,730.88 and 2,641.92 is: 3,963.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,486.72 : 12,730.88 = 2,641.92 : x
  2. Step 2: Convert to fraction form
    8,486.72/12,730.88 = 2,641.92/x
  3. Step 3: Cross multiply
    8,486.72x = 12,730.88 × 2,641.92
  4. Step 4: Simplify right side
    8,486.72x = 33,633,966.49
  5. Step 5: Solve for x
    x = 33,633,966.49/8,486.72
  6. Step 6: Final answer
    x = 3,963.13

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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.