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Finding the Fourth Proportional to 20,193.20, 30,217.80 and 12,801.20

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Solution

The fourth proportional to 20,193.20, 30,217.80 and 12,801.20 is: 19,156.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,193.20 : 30,217.80 = 12,801.20 : x
  2. Step 2: Convert to fraction form
    20,193.20/30,217.80 = 12,801.20/x
  3. Step 3: Cross multiply
    20,193.20x = 30,217.80 × 12,801.20
  4. Step 4: Simplify right side
    20,193.20x = 386,824,101.36
  5. Step 5: Solve for x
    x = 386,824,101.36/20,193.20
  6. Step 6: Final answer
    x = 19,156.16

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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.