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Finding the Fourth Proportional to 20,299.80, 30,407.16 and 12,900.44

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Solution

The fourth proportional to 20,299.80, 30,407.16 and 12,900.44 is: 19,323.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,299.80 : 30,407.16 = 12,900.44 : x
  2. Step 2: Convert to fraction form
    20,299.80/30,407.16 = 12,900.44/x
  3. Step 3: Cross multiply
    20,299.80x = 30,407.16 × 12,900.44
  4. Step 4: Simplify right side
    20,299.80x = 392,265,743.15
  5. Step 5: Solve for x
    x = 392,265,743.15/20,299.80
  6. Step 6: Final answer
    x = 19,323.63

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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.