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Finding the Fourth Proportional to 20,391.46, 30,545.67 and 18,690.46

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Solution

The fourth proportional to 20,391.46, 30,545.67 and 18,690.46 is: 27,997.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,391.46 : 30,545.67 = 18,690.46 : x
  2. Step 2: Convert to fraction form
    20,391.46/30,545.67 = 18,690.46/x
  3. Step 3: Cross multiply
    20,391.46x = 30,545.67 × 18,690.46
  4. Step 4: Simplify right side
    20,391.46x = 570,912,623.31
  5. Step 5: Solve for x
    x = 570,912,623.31/20,391.46
  6. Step 6: Final answer
    x = 27,997.63

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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.