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Finding the Fourth Proportional to 21,679.78, 32,519.20 and 9,992.99

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Solution

The fourth proportional to 21,679.78, 32,519.20 and 9,992.99 is: 14,989.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,679.78 : 32,519.20 = 9,992.99 : x
  2. Step 2: Convert to fraction form
    21,679.78/32,519.20 = 9,992.99/x
  3. Step 3: Cross multiply
    21,679.78x = 32,519.20 × 9,992.99
  4. Step 4: Simplify right side
    21,679.78x = 324,964,040.41
  5. Step 5: Solve for x
    x = 324,964,040.41/21,679.78
  6. Step 6: Final answer
    x = 14,989.27

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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.