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Finding the Fourth Proportional to 39,651, 54,718.38 and 21,987

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Solution

The fourth proportional to 39,651, 54,718.38 and 21,987 is: 30,342.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,651 : 54,718.38 = 21,987 : x
  2. Step 2: Convert to fraction form
    39,651/54,718.38 = 21,987/x
  3. Step 3: Cross multiply
    39,651x = 54,718.38 × 21,987
  4. Step 4: Simplify right side
    39,651x = 1,203,093,021.06
  5. Step 5: Solve for x
    x = 1,203,093,021.06/39,651
  6. Step 6: Final answer
    x = 30,342.06

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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.