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Finding the Fourth Proportional to 12,561.78, 18,842.79 and 3,327.78

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Solution

The fourth proportional to 12,561.78, 18,842.79 and 3,327.78 is: 4,991.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,561.78 : 18,842.79 = 3,327.78 : x
  2. Step 2: Convert to fraction form
    12,561.78/18,842.79 = 3,327.78/x
  3. Step 3: Cross multiply
    12,561.78x = 18,842.79 × 3,327.78
  4. Step 4: Simplify right side
    12,561.78x = 62,704,659.71
  5. Step 5: Solve for x
    x = 62,704,659.71/12,561.78
  6. Step 6: Final answer
    x = 4,991.70

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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.