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Finding the Fourth Proportional to 54,019.60, 81,005.10 and 20,728.60

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Solution

The fourth proportional to 54,019.60, 81,005.10 and 20,728.60 is: 31,083.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,019.60 : 81,005.10 = 20,728.60 : x
  2. Step 2: Convert to fraction form
    54,019.60/81,005.10 = 20,728.60/x
  3. Step 3: Cross multiply
    54,019.60x = 81,005.10 × 20,728.60
  4. Step 4: Simplify right side
    54,019.60x = 1,679,122,315.86
  5. Step 5: Solve for x
    x = 1,679,122,315.86/54,019.60
  6. Step 6: Final answer
    x = 31,083.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.