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Finding the Fourth Proportional to 39,765.43, 54,874.01 and 21,860.43

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Solution

The fourth proportional to 39,765.43, 54,874.01 and 21,860.43 is: 30,166.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,765.43 : 54,874.01 = 21,860.43 : x
  2. Step 2: Convert to fraction form
    39,765.43/54,874.01 = 21,860.43/x
  3. Step 3: Cross multiply
    39,765.43x = 54,874.01 × 21,860.43
  4. Step 4: Simplify right side
    39,765.43x = 1,199,569,489.00
  5. Step 5: Solve for x
    x = 1,199,569,489.00/39,765.43
  6. Step 6: Final answer
    x = 30,166.14

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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.