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Finding the Fourth Proportional to 39,391.80, 54,361.83 and 21,487.97

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Solution

The fourth proportional to 39,391.80, 54,361.83 and 21,487.97 is: 29,654.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,391.80 : 54,361.83 = 21,487.97 : x
  2. Step 2: Convert to fraction form
    39,391.80/54,361.83 = 21,487.97/x
  3. Step 3: Cross multiply
    39,391.80x = 54,361.83 × 21,487.97
  4. Step 4: Simplify right side
    39,391.80x = 1,168,125,100.38
  5. Step 5: Solve for x
    x = 1,168,125,100.38/39,391.80
  6. Step 6: Final answer
    x = 29,654.02

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1.5x scale

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.