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Finding the Fourth Proportional to 115,909.90, 173,821.65 and 80,745.10

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Solution

The fourth proportional to 115,909.90, 173,821.65 and 80,745.10 is: 121,087.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,909.90 : 173,821.65 = 80,745.10 : x
  2. Step 2: Convert to fraction form
    115,909.90/173,821.65 = 80,745.10/x
  3. Step 3: Cross multiply
    115,909.90x = 173,821.65 × 80,745.10
  4. Step 4: Simplify right side
    115,909.90x = 14,035,246,511.42
  5. Step 5: Solve for x
    x = 14,035,246,511.42/115,909.90
  6. Step 6: Final answer
    x = 121,087.56

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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.