Home / 21,000.82-31,514.42-8,520.90

Finding the Fourth Proportional to 21,000.82, 31,514.42 and 8,520.90

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Solution

The fourth proportional to 21,000.82, 31,514.42 and 8,520.90 is: 12,786.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,000.82 : 31,514.42 = 8,520.90 : x
  2. Step 2: Convert to fraction form
    21,000.82/31,514.42 = 8,520.90/x
  3. Step 3: Cross multiply
    21,000.82x = 31,514.42 × 8,520.90
  4. Step 4: Simplify right side
    21,000.82x = 268,531,221.38
  5. Step 5: Solve for x
    x = 268,531,221.38/21,000.82
  6. Step 6: Final answer
    x = 12,786.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.