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Finding the Fourth Proportional to 127,906.40, 191,875.80 and 68,660.72

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Solution

The fourth proportional to 127,906.40, 191,875.80 and 68,660.72 is: 102,999.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,906.40 : 191,875.80 = 68,660.72 : x
  2. Step 2: Convert to fraction form
    127,906.40/191,875.80 = 68,660.72/x
  3. Step 3: Cross multiply
    127,906.40x = 191,875.80 × 68,660.72
  4. Step 4: Simplify right side
    127,906.40x = 13,174,330,578.58
  5. Step 5: Solve for x
    x = 13,174,330,578.58/127,906.40
  6. Step 6: Final answer
    x = 102,999.78

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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.