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Finding the Fourth Proportional to 8,654.20, 12,981.30 and 2,811.40

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Solution

The fourth proportional to 8,654.20, 12,981.30 and 2,811.40 is: 4,217.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,654.20 : 12,981.30 = 2,811.40 : x
  2. Step 2: Convert to fraction form
    8,654.20/12,981.30 = 2,811.40/x
  3. Step 3: Cross multiply
    8,654.20x = 12,981.30 × 2,811.40
  4. Step 4: Simplify right side
    8,654.20x = 36,495,626.82
  5. Step 5: Solve for x
    x = 36,495,626.82/8,654.20
  6. Step 6: Final answer
    x = 4,217.10

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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.