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Finding the Fourth Proportional to 17,812.61, 26,728.21 and 12,922.61

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Solution

The fourth proportional to 17,812.61, 26,728.21 and 12,922.61 is: 19,390.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,812.61 : 26,728.21 = 12,922.61 : x
  2. Step 2: Convert to fraction form
    17,812.61/26,728.21 = 12,922.61/x
  3. Step 3: Cross multiply
    17,812.61x = 26,728.21 × 12,922.61
  4. Step 4: Simplify right side
    17,812.61x = 345,398,116.34
  5. Step 5: Solve for x
    x = 345,398,116.34/17,812.61
  6. Step 6: Final answer
    x = 19,390.65

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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.