Home / 21,115.90-29,143.04-12,161.66

Finding the Fourth Proportional to 21,115.90, 29,143.04 and 12,161.66

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Solution

The fourth proportional to 21,115.90, 29,143.04 and 12,161.66 is: 16,784.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,115.90 : 29,143.04 = 12,161.66 : x
  2. Step 2: Convert to fraction form
    21,115.90/29,143.04 = 12,161.66/x
  3. Step 3: Cross multiply
    21,115.90x = 29,143.04 × 12,161.66
  4. Step 4: Simplify right side
    21,115.90x = 354,427,743.85
  5. Step 5: Solve for x
    x = 354,427,743.85/21,115.90
  6. Step 6: Final answer
    x = 16,784.88

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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.