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Finding the Fourth Proportional to 39,781.78, 54,899.07 and 21,877.93

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Solution

The fourth proportional to 39,781.78, 54,899.07 and 21,877.93 is: 30,191.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,781.78 : 54,899.07 = 21,877.93 : x
  2. Step 2: Convert to fraction form
    39,781.78/54,899.07 = 21,877.93/x
  3. Step 3: Cross multiply
    39,781.78x = 54,899.07 × 21,877.93
  4. Step 4: Simplify right side
    39,781.78x = 1,201,078,010.53
  5. Step 5: Solve for x
    x = 1,201,078,010.53/39,781.78
  6. Step 6: Final answer
    x = 30,191.66

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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.