Home / 15,711.78-21,682.26-8,638.68

Finding the Fourth Proportional to 15,711.78, 21,682.26 and 8,638.68

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Solution

The fourth proportional to 15,711.78, 21,682.26 and 8,638.68 is: 11,921.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,711.78 : 21,682.26 = 8,638.68 : x
  2. Step 2: Convert to fraction form
    15,711.78/21,682.26 = 8,638.68/x
  3. Step 3: Cross multiply
    15,711.78x = 21,682.26 × 8,638.68
  4. Step 4: Simplify right side
    15,711.78x = 187,306,105.82
  5. Step 5: Solve for x
    x = 187,306,105.82/15,711.78
  6. Step 6: Final answer
    x = 11,921.38

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Half scale
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Double scale
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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.