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Finding the Fourth Proportional to 128,999.40, 193,499.10 and 115,221.30

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Solution

The fourth proportional to 128,999.40, 193,499.10 and 115,221.30 is: 172,831.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,999.40 : 193,499.10 = 115,221.30 : x
  2. Step 2: Convert to fraction form
    128,999.40/193,499.10 = 115,221.30/x
  3. Step 3: Cross multiply
    128,999.40x = 193,499.10 × 115,221.30
  4. Step 4: Simplify right side
    128,999.40x = 22,295,217,850.83
  5. Step 5: Solve for x
    x = 22,295,217,850.83/128,999.40
  6. Step 6: Final answer
    x = 172,831.95

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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.