Home / 15,697-21,660.78-8,621.96

Finding the Fourth Proportional to 15,697, 21,660.78 and 8,621.96

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Solution

The fourth proportional to 15,697, 21,660.78 and 8,621.96 is: 11,897.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,697 : 21,660.78 = 8,621.96 : x
  2. Step 2: Convert to fraction form
    15,697/21,660.78 = 8,621.96/x
  3. Step 3: Cross multiply
    15,697x = 21,660.78 × 8,621.96
  4. Step 4: Simplify right side
    15,697x = 186,758,378.73
  5. Step 5: Solve for x
    x = 186,758,378.73/15,697
  6. Step 6: Final answer
    x = 11,897.71

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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.