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Finding the Fourth Proportional to 39,781.92, 54,900.30 and 21,878.22

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Solution

The fourth proportional to 39,781.92, 54,900.30 and 21,878.22 is: 30,192.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,781.92 : 54,900.30 = 21,878.22 : x
  2. Step 2: Convert to fraction form
    39,781.92/54,900.30 = 21,878.22/x
  3. Step 3: Cross multiply
    39,781.92x = 54,900.30 × 21,878.22
  4. Step 4: Simplify right side
    39,781.92x = 1,201,120,841.47
  5. Step 5: Solve for x
    x = 1,201,120,841.47/39,781.92
  6. Step 6: Final answer
    x = 30,192.63

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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.