Home / 21,539.88-29,721.96-11,979.18

Finding the Fourth Proportional to 21,539.88, 29,721.96 and 11,979.18

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Solution

The fourth proportional to 21,539.88, 29,721.96 and 11,979.18 is: 16,529.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,539.88 : 29,721.96 = 11,979.18 : x
  2. Step 2: Convert to fraction form
    21,539.88/29,721.96 = 11,979.18/x
  3. Step 3: Cross multiply
    21,539.88x = 29,721.96 × 11,979.18
  4. Step 4: Simplify right side
    21,539.88x = 356,044,708.79
  5. Step 5: Solve for x
    x = 356,044,708.79/21,539.88
  6. Step 6: Final answer
    x = 16,529.56

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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.