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Finding the Fourth Proportional to 54,005.20, 81,007.80 and 18,941.20

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Solution

The fourth proportional to 54,005.20, 81,007.80 and 18,941.20 is: 28,411.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,005.20 : 81,007.80 = 18,941.20 : x
  2. Step 2: Convert to fraction form
    54,005.20/81,007.80 = 18,941.20/x
  3. Step 3: Cross multiply
    54,005.20x = 81,007.80 × 18,941.20
  4. Step 4: Simplify right side
    54,005.20x = 1,534,384,941.36
  5. Step 5: Solve for x
    x = 1,534,384,941.36/54,005.20
  6. Step 6: Final answer
    x = 28,411.80

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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.