Home / 15,709.91-21,679.73-8,636.78

Finding the Fourth Proportional to 15,709.91, 21,679.73 and 8,636.78

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Solution

The fourth proportional to 15,709.91, 21,679.73 and 8,636.78 is: 11,918.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,709.91 : 21,679.73 = 8,636.78 : x
  2. Step 2: Convert to fraction form
    15,709.91/21,679.73 = 8,636.78/x
  3. Step 3: Cross multiply
    15,709.91x = 21,679.73 × 8,636.78
  4. Step 4: Simplify right side
    15,709.91x = 187,242,906.89
  5. Step 5: Solve for x
    x = 187,242,906.89/15,709.91
  6. Step 6: Final answer
    x = 11,918.78

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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.