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Finding the Fourth Proportional to 54,580.40, 81,874.40 and 21,289.40

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Solution

The fourth proportional to 54,580.40, 81,874.40 and 21,289.40 is: 31,935.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,580.40 : 81,874.40 = 21,289.40 : x
  2. Step 2: Convert to fraction form
    54,580.40/81,874.40 = 21,289.40/x
  3. Step 3: Cross multiply
    54,580.40x = 81,874.40 × 21,289.40
  4. Step 4: Simplify right side
    54,580.40x = 1,743,056,851.36
  5. Step 5: Solve for x
    x = 1,743,056,851.36/54,580.40
  6. Step 6: Final answer
    x = 31,935.58

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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.