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Finding the Fourth Proportional to 115,107.67, 172,603.65 and 67,091.74

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Solution

The fourth proportional to 115,107.67, 172,603.65 and 67,091.74 is: 100,603.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,107.67 : 172,603.65 = 67,091.74 : x
  2. Step 2: Convert to fraction form
    115,107.67/172,603.65 = 67,091.74/x
  3. Step 3: Cross multiply
    115,107.67x = 172,603.65 × 67,091.74
  4. Step 4: Simplify right side
    115,107.67x = 11,580,279,208.85
  5. Step 5: Solve for x
    x = 11,580,279,208.85/115,107.67
  6. Step 6: Final answer
    x = 100,603.89

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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.