Home / 21,122.78-29,142.30-12,170.05

Finding the Fourth Proportional to 21,122.78, 29,142.30 and 12,170.05

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Solution

The fourth proportional to 21,122.78, 29,142.30 and 12,170.05 is: 16,790.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,122.78 : 29,142.30 = 12,170.05 : x
  2. Step 2: Convert to fraction form
    21,122.78/29,142.30 = 12,170.05/x
  3. Step 3: Cross multiply
    21,122.78x = 29,142.30 × 12,170.05
  4. Step 4: Simplify right side
    21,122.78x = 354,663,187.26
  5. Step 5: Solve for x
    x = 354,663,187.26/21,122.78
  6. Step 6: Final answer
    x = 16,790.55

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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.