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Finding the Fourth Proportional to 54,158.40, 81,237.60 and 53,812.80

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Solution

The fourth proportional to 54,158.40, 81,237.60 and 53,812.80 is: 80,719.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,158.40 : 81,237.60 = 53,812.80 : x
  2. Step 2: Convert to fraction form
    54,158.40/81,237.60 = 53,812.80/x
  3. Step 3: Cross multiply
    54,158.40x = 81,237.60 × 53,812.80
  4. Step 4: Simplify right side
    54,158.40x = 4,371,622,721.28
  5. Step 5: Solve for x
    x = 4,371,622,721.28/54,158.40
  6. Step 6: Final answer
    x = 80,719.20

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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.