Home / 21,828.62-30,122.10-12,876.50

Finding the Fourth Proportional to 21,828.62, 30,122.10 and 12,876.50

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Solution

The fourth proportional to 21,828.62, 30,122.10 and 12,876.50 is: 17,768.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,828.62 : 30,122.10 = 12,876.50 : x
  2. Step 2: Convert to fraction form
    21,828.62/30,122.10 = 12,876.50/x
  3. Step 3: Cross multiply
    21,828.62x = 30,122.10 × 12,876.50
  4. Step 4: Simplify right side
    21,828.62x = 387,867,220.65
  5. Step 5: Solve for x
    x = 387,867,220.65/21,828.62
  6. Step 6: Final answer
    x = 17,768.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.