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Finding the Fourth Proportional to 54,658.11, 81,968.80 and 20,916.25

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Solution

The fourth proportional to 54,658.11, 81,968.80 and 20,916.25 is: 31,367.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    54,658.11 : 81,968.80 = 20,916.25 : x
  2. Step 2: Convert to fraction form
    54,658.11/81,968.80 = 20,916.25/x
  3. Step 3: Cross multiply
    54,658.11x = 81,968.80 × 20,916.25
  4. Step 4: Simplify right side
    54,658.11x = 1,714,479,913
  5. Step 5: Solve for x
    x = 1,714,479,913/54,658.11
  6. Step 6: Final answer
    x = 31,367.35

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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.