Home / 20,723.70-31,085.55-18,909.30

Finding the Fourth Proportional to 20,723.70, 31,085.55 and 18,909.30

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Solution

The fourth proportional to 20,723.70, 31,085.55 and 18,909.30 is: 28,363.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,723.70 : 31,085.55 = 18,909.30 : x
  2. Step 2: Convert to fraction form
    20,723.70/31,085.55 = 18,909.30/x
  3. Step 3: Cross multiply
    20,723.70x = 31,085.55 × 18,909.30
  4. Step 4: Simplify right side
    20,723.70x = 587,805,990.62
  5. Step 5: Solve for x
    x = 587,805,990.62/20,723.70
  6. Step 6: Final answer
    x = 28,363.95

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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.