Home / 21,020.41-31,514.82-9,920.78

Finding the Fourth Proportional to 21,020.41, 31,514.82 and 9,920.78

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Solution

The fourth proportional to 21,020.41, 31,514.82 and 9,920.78 is: 14,873.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,020.41 : 31,514.82 = 9,920.78 : x
  2. Step 2: Convert to fraction form
    21,020.41/31,514.82 = 9,920.78/x
  3. Step 3: Cross multiply
    21,020.41x = 31,514.82 × 9,920.78
  4. Step 4: Simplify right side
    21,020.41x = 312,651,595.96
  5. Step 5: Solve for x
    x = 312,651,595.96/21,020.41
  6. Step 6: Final answer
    x = 14,873.72

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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.