Home / 21,638.80-29,861.76-12,691.60

Finding the Fourth Proportional to 21,638.80, 29,861.76 and 12,691.60

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Solution

The fourth proportional to 21,638.80, 29,861.76 and 12,691.60 is: 17,514.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,638.80 : 29,861.76 = 12,691.60 : x
  2. Step 2: Convert to fraction form
    21,638.80/29,861.76 = 12,691.60/x
  3. Step 3: Cross multiply
    21,638.80x = 29,861.76 × 12,691.60
  4. Step 4: Simplify right side
    21,638.80x = 378,993,513.22
  5. Step 5: Solve for x
    x = 378,993,513.22/21,638.80
  6. Step 6: Final answer
    x = 17,514.53

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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.