Home / 21,139.97-29,171.45-12,181.46

Finding the Fourth Proportional to 21,139.97, 29,171.45 and 12,181.46

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Solution

The fourth proportional to 21,139.97, 29,171.45 and 12,181.46 is: 16,809.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,139.97 : 29,171.45 = 12,181.46 : x
  2. Step 2: Convert to fraction form
    21,139.97/29,171.45 = 12,181.46/x
  3. Step 3: Cross multiply
    21,139.97x = 29,171.45 × 12,181.46
  4. Step 4: Simplify right side
    21,139.97x = 355,350,790.41
  5. Step 5: Solve for x
    x = 355,350,790.41/21,139.97
  6. Step 6: Final answer
    x = 16,809.43

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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.