Home / 15,721.88-21,696-8,648.24

Finding the Fourth Proportional to 15,721.88, 21,696 and 8,648.24

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Solution

The fourth proportional to 15,721.88, 21,696 and 8,648.24 is: 11,934.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,721.88 : 21,696 = 8,648.24 : x
  2. Step 2: Convert to fraction form
    15,721.88/21,696 = 8,648.24/x
  3. Step 3: Cross multiply
    15,721.88x = 21,696 × 8,648.24
  4. Step 4: Simplify right side
    15,721.88x = 187,632,215.04
  5. Step 5: Solve for x
    x = 187,632,215.04/15,721.88
  6. Step 6: Final answer
    x = 11,934.46

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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.