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Finding the Fourth Proportional to 39,781.62, 54,899.03 and 21,876.75

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Solution

The fourth proportional to 39,781.62, 54,899.03 and 21,876.75 is: 30,190.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,781.62 : 54,899.03 = 21,876.75 : x
  2. Step 2: Convert to fraction form
    39,781.62/54,899.03 = 21,876.75/x
  3. Step 3: Cross multiply
    39,781.62x = 54,899.03 × 21,876.75
  4. Step 4: Simplify right side
    39,781.62x = 1,201,012,354.55
  5. Step 5: Solve for x
    x = 1,201,012,354.55/39,781.62
  6. Step 6: Final answer
    x = 30,190.13

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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.