Home / 28,355.05-39,131.27-15,780.61

Finding the Fourth Proportional to 28,355.05, 39,131.27 and 15,780.61

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Solution

The fourth proportional to 28,355.05, 39,131.27 and 15,780.61 is: 21,777.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,355.05 : 39,131.27 = 15,780.61 : x
  2. Step 2: Convert to fraction form
    28,355.05/39,131.27 = 15,780.61/x
  3. Step 3: Cross multiply
    28,355.05x = 39,131.27 × 15,780.61
  4. Step 4: Simplify right side
    28,355.05x = 617,515,310.67
  5. Step 5: Solve for x
    x = 617,515,310.67/28,355.05
  6. Step 6: Final answer
    x = 21,777.97

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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.