Home / 21,006.72-31,514.79-7,859.21

Finding the Fourth Proportional to 21,006.72, 31,514.79 and 7,859.21

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Solution

The fourth proportional to 21,006.72, 31,514.79 and 7,859.21 is: 11,790.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,006.72 : 31,514.79 = 7,859.21 : x
  2. Step 2: Convert to fraction form
    21,006.72/31,514.79 = 7,859.21/x
  3. Step 3: Cross multiply
    21,006.72x = 31,514.79 × 7,859.21
  4. Step 4: Simplify right side
    21,006.72x = 247,681,195.14
  5. Step 5: Solve for x
    x = 247,681,195.14/21,006.72
  6. Step 6: Final answer
    x = 11,790.57

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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.