Home / 21,138.54-31,696.82-9,287.46

Finding the Fourth Proportional to 21,138.54, 31,696.82 and 9,287.46

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Solution

The fourth proportional to 21,138.54, 31,696.82 and 9,287.46 is: 13,926.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.54 : 31,696.82 = 9,287.46 : x
  2. Step 2: Convert to fraction form
    21,138.54/31,696.82 = 9,287.46/x
  3. Step 3: Cross multiply
    21,138.54x = 31,696.82 × 9,287.46
  4. Step 4: Simplify right side
    21,138.54x = 294,382,947.88
  5. Step 5: Solve for x
    x = 294,382,947.88/21,138.54
  6. Step 6: Final answer
    x = 13,926.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.