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Finding the Fourth Proportional to 12,487.78, 18,736.80 and 5,912.20

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Solution

The fourth proportional to 12,487.78, 18,736.80 and 5,912.20 is: 8,870.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,487.78 : 18,736.80 = 5,912.20 : x
  2. Step 2: Convert to fraction form
    12,487.78/18,736.80 = 5,912.20/x
  3. Step 3: Cross multiply
    12,487.78x = 18,736.80 × 5,912.20
  4. Step 4: Simplify right side
    12,487.78x = 110,775,708.96
  5. Step 5: Solve for x
    x = 110,775,708.96/12,487.78
  6. Step 6: Final answer
    x = 8,870.73

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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.