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Finding the Fourth Proportional to 72,689.85, 108,923.48 and 48,909.31

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Solution

The fourth proportional to 72,689.85, 108,923.48 and 48,909.31 is: 73,289.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,689.85 : 108,923.48 = 48,909.31 : x
  2. Step 2: Convert to fraction form
    72,689.85/108,923.48 = 48,909.31/x
  3. Step 3: Cross multiply
    72,689.85x = 108,923.48 × 48,909.31
  4. Step 4: Simplify right side
    72,689.85x = 5,327,372,249.60
  5. Step 5: Solve for x
    x = 5,327,372,249.60/72,689.85
  6. Step 6: Final answer
    x = 73,289.09

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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.