Home / 39,689.66-54,768.85-21,781.78

Finding the Fourth Proportional to 39,689.66, 54,768.85 and 21,781.78

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Solution

The fourth proportional to 39,689.66, 54,768.85 and 21,781.78 is: 30,057.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,689.66 : 54,768.85 = 21,781.78 : x
  2. Step 2: Convert to fraction form
    39,689.66/54,768.85 = 21,781.78/x
  3. Step 3: Cross multiply
    39,689.66x = 54,768.85 × 21,781.78
  4. Step 4: Simplify right side
    39,689.66x = 1,192,962,850.18
  5. Step 5: Solve for x
    x = 1,192,962,850.18/39,689.66
  6. Step 6: Final answer
    x = 30,057.27

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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.