Home / 21,456.88-32,160.40-8,121.40

Finding the Fourth Proportional to 21,456.88, 32,160.40 and 8,121.40

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Solution

The fourth proportional to 21,456.88, 32,160.40 and 8,121.40 is: 12,172.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,456.88 : 32,160.40 = 8,121.40 : x
  2. Step 2: Convert to fraction form
    21,456.88/32,160.40 = 8,121.40/x
  3. Step 3: Cross multiply
    21,456.88x = 32,160.40 × 8,121.40
  4. Step 4: Simplify right side
    21,456.88x = 261,187,371.86
  5. Step 5: Solve for x
    x = 261,187,371.86/21,456.88
  6. Step 6: Final answer
    x = 12,172.66

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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.