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Finding the Fourth Proportional to 20,039.97, 30,031.20 and 11,256.40

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Solution

The fourth proportional to 20,039.97, 30,031.20 and 11,256.40 is: 16,868.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,039.97 : 30,031.20 = 11,256.40 : x
  2. Step 2: Convert to fraction form
    20,039.97/30,031.20 = 11,256.40/x
  3. Step 3: Cross multiply
    20,039.97x = 30,031.20 × 11,256.40
  4. Step 4: Simplify right side
    20,039.97x = 338,043,124.60
  5. Step 5: Solve for x
    x = 338,043,124.60/20,039.97
  6. Step 6: Final answer
    x = 16,868.44

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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.