Home / 20,911.56-31,327.25-12,990.57

Finding the Fourth Proportional to 20,911.56, 31,327.25 and 12,990.57

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Solution

The fourth proportional to 20,911.56, 31,327.25 and 12,990.57 is: 19,460.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,911.56 : 31,327.25 = 12,990.57 : x
  2. Step 2: Convert to fraction form
    20,911.56/31,327.25 = 12,990.57/x
  3. Step 3: Cross multiply
    20,911.56x = 31,327.25 × 12,990.57
  4. Step 4: Simplify right side
    20,911.56x = 406,958,769.08
  5. Step 5: Solve for x
    x = 406,958,769.08/20,911.56
  6. Step 6: Final answer
    x = 19,460.95

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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.