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Finding the Fourth Proportional to 21,229.92, 31,855.92 and 11,864.16

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Solution

The fourth proportional to 21,229.92, 31,855.92 and 11,864.16 is: 17,802.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,229.92 : 31,855.92 = 11,864.16 : x
  2. Step 2: Convert to fraction form
    21,229.92/31,855.92 = 11,864.16/x
  3. Step 3: Cross multiply
    21,229.92x = 31,855.92 × 11,864.16
  4. Step 4: Simplify right side
    21,229.92x = 377,943,731.83
  5. Step 5: Solve for x
    x = 377,943,731.83/21,229.92
  6. Step 6: Final answer
    x = 17,802.41

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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.