Home / 21,278.83-31,918.23-9,578.38

Finding the Fourth Proportional to 21,278.83, 31,918.23 and 9,578.38

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Solution

The fourth proportional to 21,278.83, 31,918.23 and 9,578.38 is: 14,367.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,278.83 : 31,918.23 = 9,578.38 : x
  2. Step 2: Convert to fraction form
    21,278.83/31,918.23 = 9,578.38/x
  3. Step 3: Cross multiply
    21,278.83x = 31,918.23 × 9,578.38
  4. Step 4: Simplify right side
    21,278.83x = 305,724,935.87
  5. Step 5: Solve for x
    x = 305,724,935.87/21,278.83
  6. Step 6: Final answer
    x = 14,367.56

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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.