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Finding the Fourth Proportional to 54,216.60, 81,324.90 and 20,938.20

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Solution

The fourth proportional to 54,216.60, 81,324.90 and 20,938.20 is: 31,407.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,216.60 : 81,324.90 = 20,938.20 : x
  2. Step 2: Convert to fraction form
    54,216.60/81,324.90 = 20,938.20/x
  3. Step 3: Cross multiply
    54,216.60x = 81,324.90 × 20,938.20
  4. Step 4: Simplify right side
    54,216.60x = 1,702,797,021.18
  5. Step 5: Solve for x
    x = 1,702,797,021.18/54,216.60
  6. Step 6: Final answer
    x = 31,407.30

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1.5x scale

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.