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Finding the Fourth Proportional to 8,787.80, 13,167.30 and 8,269.40

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Solution

The fourth proportional to 8,787.80, 13,167.30 and 8,269.40 is: 12,390.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,787.80 : 13,167.30 = 8,269.40 : x
  2. Step 2: Convert to fraction form
    8,787.80/13,167.30 = 8,269.40/x
  3. Step 3: Cross multiply
    8,787.80x = 13,167.30 × 8,269.40
  4. Step 4: Simplify right side
    8,787.80x = 108,885,670.62
  5. Step 5: Solve for x
    x = 108,885,670.62/8,787.80
  6. Step 6: Final answer
    x = 12,390.55

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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.