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Finding the Fourth Proportional to 115,640.80, 173,288.40 and 98,015.20

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Solution

The fourth proportional to 115,640.80, 173,288.40 and 98,015.20 is: 146,876.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,640.80 : 173,288.40 = 98,015.20 : x
  2. Step 2: Convert to fraction form
    115,640.80/173,288.40 = 98,015.20/x
  3. Step 3: Cross multiply
    115,640.80x = 173,288.40 × 98,015.20
  4. Step 4: Simplify right side
    115,640.80x = 16,984,897,183.68
  5. Step 5: Solve for x
    x = 16,984,897,183.68/115,640.80
  6. Step 6: Final answer
    x = 146,876.34

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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.