Home / 18,881.76-28,321.40-7,785.56

Finding the Fourth Proportional to 18,881.76, 28,321.40 and 7,785.56

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Solution

The fourth proportional to 18,881.76, 28,321.40 and 7,785.56 is: 11,677.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,881.76 : 28,321.40 = 7,785.56 : x
  2. Step 2: Convert to fraction form
    18,881.76/28,321.40 = 7,785.56/x
  3. Step 3: Cross multiply
    18,881.76x = 28,321.40 × 7,785.56
  4. Step 4: Simplify right side
    18,881.76x = 220,497,958.98
  5. Step 5: Solve for x
    x = 220,497,958.98/18,881.76
  6. Step 6: Final answer
    x = 11,677.83

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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.