Home / 20,990.58-31,499.70-7,842.95

Finding the Fourth Proportional to 20,990.58, 31,499.70 and 7,842.95

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Solution

The fourth proportional to 20,990.58, 31,499.70 and 7,842.95 is: 11,769.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,990.58 : 31,499.70 = 7,842.95 : x
  2. Step 2: Convert to fraction form
    20,990.58/31,499.70 = 7,842.95/x
  3. Step 3: Cross multiply
    20,990.58x = 31,499.70 × 7,842.95
  4. Step 4: Simplify right side
    20,990.58x = 247,050,414.62
  5. Step 5: Solve for x
    x = 247,050,414.62/20,990.58
  6. Step 6: Final answer
    x = 11,769.59

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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.