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Finding the Fourth Proportional to 20,235.60, 30,371.40 and 11,905.20

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Solution

The fourth proportional to 20,235.60, 30,371.40 and 11,905.20 is: 17,868.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,235.60 : 30,371.40 = 11,905.20 : x
  2. Step 2: Convert to fraction form
    20,235.60/30,371.40 = 11,905.20/x
  3. Step 3: Cross multiply
    20,235.60x = 30,371.40 × 11,905.20
  4. Step 4: Simplify right side
    20,235.60x = 361,577,591.28
  5. Step 5: Solve for x
    x = 361,577,591.28/20,235.60
  6. Step 6: Final answer
    x = 17,868.39

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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.