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Finding the Fourth Proportional to 115,093.80, 172,640.70 and 31,987.80

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Solution

The fourth proportional to 115,093.80, 172,640.70 and 31,987.80 is: 47,981.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,093.80 : 172,640.70 = 31,987.80 : x
  2. Step 2: Convert to fraction form
    115,093.80/172,640.70 = 31,987.80/x
  3. Step 3: Cross multiply
    115,093.80x = 172,640.70 × 31,987.80
  4. Step 4: Simplify right side
    115,093.80x = 5,522,396,183.46
  5. Step 5: Solve for x
    x = 5,522,396,183.46/115,093.80
  6. Step 6: Final answer
    x = 47,981.70

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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.