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Finding the Fourth Proportional to 8,451.87, 12,678.09 and 2,905.17

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Solution

The fourth proportional to 8,451.87, 12,678.09 and 2,905.17 is: 4,357.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,451.87 : 12,678.09 = 2,905.17 : x
  2. Step 2: Convert to fraction form
    8,451.87/12,678.09 = 2,905.17/x
  3. Step 3: Cross multiply
    8,451.87x = 12,678.09 × 2,905.17
  4. Step 4: Simplify right side
    8,451.87x = 36,831,972.80
  5. Step 5: Solve for x
    x = 36,831,972.80/8,451.87
  6. Step 6: Final answer
    x = 4,357.85

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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.