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Finding the Fourth Proportional to 81,921.40, 122,817.30 and 44,985.40

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Solution

The fourth proportional to 81,921.40, 122,817.30 and 44,985.40 is: 67,442.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,921.40 : 122,817.30 = 44,985.40 : x
  2. Step 2: Convert to fraction form
    81,921.40/122,817.30 = 44,985.40/x
  3. Step 3: Cross multiply
    81,921.40x = 122,817.30 × 44,985.40
  4. Step 4: Simplify right side
    81,921.40x = 5,524,985,367.42
  5. Step 5: Solve for x
    x = 5,524,985,367.42/81,921.40
  6. Step 6: Final answer
    x = 67,442.52

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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.