Home / 39,781.28-54,899.40-21,877.04

Finding the Fourth Proportional to 39,781.28, 54,899.40 and 21,877.04

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Solution

The fourth proportional to 39,781.28, 54,899.40 and 21,877.04 is: 30,190.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,781.28 : 54,899.40 = 21,877.04 : x
  2. Step 2: Convert to fraction form
    39,781.28/54,899.40 = 21,877.04/x
  3. Step 3: Cross multiply
    39,781.28x = 54,899.40 × 21,877.04
  4. Step 4: Simplify right side
    39,781.28x = 1,201,036,369.78
  5. Step 5: Solve for x
    x = 1,201,036,369.78/39,781.28
  6. Step 6: Final answer
    x = 30,190.99

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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.