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Finding the Fourth Proportional to 8,787.29, 12,119.02 and 7,912.49

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Solution

The fourth proportional to 8,787.29, 12,119.02 and 7,912.49 is: 10,912.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,787.29 : 12,119.02 = 7,912.49 : x
  2. Step 2: Convert to fraction form
    8,787.29/12,119.02 = 7,912.49/x
  3. Step 3: Cross multiply
    8,787.29x = 12,119.02 × 7,912.49
  4. Step 4: Simplify right side
    8,787.29x = 95,891,544.18
  5. Step 5: Solve for x
    x = 95,891,544.18/8,787.29
  6. Step 6: Final answer
    x = 10,912.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.