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Finding the Fourth Proportional to 20,715.20, 31,072.80 and 18,900.80

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Solution

The fourth proportional to 20,715.20, 31,072.80 and 18,900.80 is: 28,351.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,715.20 : 31,072.80 = 18,900.80 : x
  2. Step 2: Convert to fraction form
    20,715.20/31,072.80 = 18,900.80/x
  3. Step 3: Cross multiply
    20,715.20x = 31,072.80 × 18,900.80
  4. Step 4: Simplify right side
    20,715.20x = 587,300,778.24
  5. Step 5: Solve for x
    x = 587,300,778.24/20,715.20
  6. Step 6: Final answer
    x = 28,351.20

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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.