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Finding the Fourth Proportional to 39,781.62, 54,900.06 and 21,878.01

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Solution

The fourth proportional to 39,781.62, 54,900.06 and 21,878.01 is: 30,192.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,781.62 : 54,900.06 = 21,878.01 : x
  2. Step 2: Convert to fraction form
    39,781.62/54,900.06 = 21,878.01/x
  3. Step 3: Cross multiply
    39,781.62x = 54,900.06 × 21,878.01
  4. Step 4: Simplify right side
    39,781.62x = 1,201,104,061.68
  5. Step 5: Solve for x
    x = 1,201,104,061.68/39,781.62
  6. Step 6: Final answer
    x = 30,192.44

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.