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Finding the Fourth Proportional to 20,910.31, 28,843.11 and 12,406.41

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Solution

The fourth proportional to 20,910.31, 28,843.11 and 12,406.41 is: 17,113.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,910.31 : 28,843.11 = 12,406.41 : x
  2. Step 2: Convert to fraction form
    20,910.31/28,843.11 = 12,406.41/x
  3. Step 3: Cross multiply
    20,910.31x = 28,843.11 × 12,406.41
  4. Step 4: Simplify right side
    20,910.31x = 357,839,448.34
  5. Step 5: Solve for x
    x = 357,839,448.34/20,910.31
  6. Step 6: Final answer
    x = 17,113.06

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.