Home / 21,721.56-29,982.84-12,768.84

Finding the Fourth Proportional to 21,721.56, 29,982.84 and 12,768.84

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Solution

The fourth proportional to 21,721.56, 29,982.84 and 12,768.84 is: 17,625.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,721.56 : 29,982.84 = 12,768.84 : x
  2. Step 2: Convert to fraction form
    21,721.56/29,982.84 = 12,768.84/x
  3. Step 3: Cross multiply
    21,721.56x = 29,982.84 × 12,768.84
  4. Step 4: Simplify right side
    21,721.56x = 382,846,086.71
  5. Step 5: Solve for x
    x = 382,846,086.71/21,721.56
  6. Step 6: Final answer
    x = 17,625.17

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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.