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Finding the Fourth Proportional to 72,003.60, 108,005.40 and 64,640.70

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Solution

The fourth proportional to 72,003.60, 108,005.40 and 64,640.70 is: 96,961.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,003.60 : 108,005.40 = 64,640.70 : x
  2. Step 2: Convert to fraction form
    72,003.60/108,005.40 = 64,640.70/x
  3. Step 3: Cross multiply
    72,003.60x = 108,005.40 × 64,640.70
  4. Step 4: Simplify right side
    72,003.60x = 6,981,544,659.78
  5. Step 5: Solve for x
    x = 6,981,544,659.78/72,003.60
  6. Step 6: Final answer
    x = 96,961.05

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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.