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Finding the Fourth Proportional to 81,403.70, 122,105.55 and 74,405.30

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Solution

The fourth proportional to 81,403.70, 122,105.55 and 74,405.30 is: 111,607.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,403.70 : 122,105.55 = 74,405.30 : x
  2. Step 2: Convert to fraction form
    81,403.70/122,105.55 = 74,405.30/x
  3. Step 3: Cross multiply
    81,403.70x = 122,105.55 × 74,405.30
  4. Step 4: Simplify right side
    81,403.70x = 9,085,300,079.42
  5. Step 5: Solve for x
    x = 9,085,300,079.42/81,403.70
  6. Step 6: Final answer
    x = 111,607.95

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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.