Home / 21,824.16-30,120.77-12,872.66

Finding the Fourth Proportional to 21,824.16, 30,120.77 and 12,872.66

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Solution

The fourth proportional to 21,824.16, 30,120.77 and 12,872.66 is: 17,766.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,824.16 : 30,120.77 = 12,872.66 : x
  2. Step 2: Convert to fraction form
    21,824.16/30,120.77 = 12,872.66/x
  3. Step 3: Cross multiply
    21,824.16x = 30,120.77 × 12,872.66
  4. Step 4: Simplify right side
    21,824.16x = 387,734,216.18
  5. Step 5: Solve for x
    x = 387,734,216.18/21,824.16
  6. Step 6: Final answer
    x = 17,766.28

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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.