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Finding the Fourth Proportional to 15,721.88, 21,696.26 and 8,648.82

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Solution

The fourth proportional to 15,721.88, 21,696.26 and 8,648.82 is: 11,935.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,721.88 : 21,696.26 = 8,648.82 : x
  2. Step 2: Convert to fraction form
    15,721.88/21,696.26 = 8,648.82/x
  3. Step 3: Cross multiply
    15,721.88x = 21,696.26 × 8,648.82
  4. Step 4: Simplify right side
    15,721.88x = 187,647,004.17
  5. Step 5: Solve for x
    x = 187,647,004.17/15,721.88
  6. Step 6: Final answer
    x = 11,935.41

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1.5x scale

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.