Home / 39,685.11-54,766.13-21,781.78

Finding the Fourth Proportional to 39,685.11, 54,766.13 and 21,781.78

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Solution

The fourth proportional to 39,685.11, 54,766.13 and 21,781.78 is: 30,059.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,685.11 : 54,766.13 = 21,781.78 : x
  2. Step 2: Convert to fraction form
    39,685.11/54,766.13 = 21,781.78/x
  3. Step 3: Cross multiply
    39,685.11x = 54,766.13 × 21,781.78
  4. Step 4: Simplify right side
    39,685.11x = 1,192,903,795.11
  5. Step 5: Solve for x
    x = 1,192,903,795.11/39,685.11
  6. Step 6: Final answer
    x = 30,059.23

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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.