Home / 21,136.62-31,707.36-12,371.61

Finding the Fourth Proportional to 21,136.62, 31,707.36 and 12,371.61

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Solution

The fourth proportional to 21,136.62, 31,707.36 and 12,371.61 is: 18,558.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,136.62 : 31,707.36 = 12,371.61 : x
  2. Step 2: Convert to fraction form
    21,136.62/31,707.36 = 12,371.61/x
  3. Step 3: Cross multiply
    21,136.62x = 31,707.36 × 12,371.61
  4. Step 4: Simplify right side
    21,136.62x = 392,271,092.05
  5. Step 5: Solve for x
    x = 392,271,092.05/21,136.62
  6. Step 6: Final answer
    x = 18,558.84

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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.