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Finding the Fourth Proportional to 128,679.12, 193,046.40 and 39,930.88

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Solution

The fourth proportional to 128,679.12, 193,046.40 and 39,930.88 is: 59,904.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,679.12 : 193,046.40 = 39,930.88 : x
  2. Step 2: Convert to fraction form
    128,679.12/193,046.40 = 39,930.88/x
  3. Step 3: Cross multiply
    128,679.12x = 193,046.40 × 39,930.88
  4. Step 4: Simplify right side
    128,679.12x = 7,708,512,632.83
  5. Step 5: Solve for x
    x = 7,708,512,632.83/128,679.12
  6. Step 6: Final answer
    x = 59,904.92

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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.