Home / 21,305.28-31,922.59-12,960.05

Finding the Fourth Proportional to 21,305.28, 31,922.59 and 12,960.05

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Solution

The fourth proportional to 21,305.28, 31,922.59 and 12,960.05 is: 19,418.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,305.28 : 31,922.59 = 12,960.05 : x
  2. Step 2: Convert to fraction form
    21,305.28/31,922.59 = 12,960.05/x
  3. Step 3: Cross multiply
    21,305.28x = 31,922.59 × 12,960.05
  4. Step 4: Simplify right side
    21,305.28x = 413,718,362.53
  5. Step 5: Solve for x
    x = 413,718,362.53/21,305.28
  6. Step 6: Final answer
    x = 19,418.58

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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.