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Finding the Fourth Proportional to 148,728.74, 205,245.90 and 80,745.71

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Solution

The fourth proportional to 148,728.74, 205,245.90 and 80,745.71 is: 111,429.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    148,728.74 : 205,245.90 = 80,745.71 : x
  2. Step 2: Convert to fraction form
    148,728.74/205,245.90 = 80,745.71/x
  3. Step 3: Cross multiply
    148,728.74x = 205,245.90 × 80,745.71
  4. Step 4: Simplify right side
    148,728.74x = 16,572,724,893.86
  5. Step 5: Solve for x
    x = 16,572,724,893.86/148,728.74
  6. Step 6: Final answer
    x = 111,429.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.