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Finding the Fourth Proportional to 20,351.80, 30,531.30 and 7,211.80

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Solution

The fourth proportional to 20,351.80, 30,531.30 and 7,211.80 is: 10,818.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,351.80 : 30,531.30 = 7,211.80 : x
  2. Step 2: Convert to fraction form
    20,351.80/30,531.30 = 7,211.80/x
  3. Step 3: Cross multiply
    20,351.80x = 30,531.30 × 7,211.80
  4. Step 4: Simplify right side
    20,351.80x = 220,185,629.34
  5. Step 5: Solve for x
    x = 220,185,629.34/20,351.80
  6. Step 6: Final answer
    x = 10,818.98

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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.