Home / 21,428.49-29,571.39-11,868.65

Finding the Fourth Proportional to 21,428.49, 29,571.39 and 11,868.65

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Solution

The fourth proportional to 21,428.49, 29,571.39 and 11,868.65 is: 16,378.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,428.49 : 29,571.39 = 11,868.65 : x
  2. Step 2: Convert to fraction form
    21,428.49/29,571.39 = 11,868.65/x
  3. Step 3: Cross multiply
    21,428.49x = 29,571.39 × 11,868.65
  4. Step 4: Simplify right side
    21,428.49x = 350,972,330.07
  5. Step 5: Solve for x
    x = 350,972,330.07/21,428.49
  6. Step 6: Final answer
    x = 16,378.77

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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.