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Finding the Fourth Proportional to 127,918.60, 191,877.90 and 81,262.60

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Solution

The fourth proportional to 127,918.60, 191,877.90 and 81,262.60 is: 121,893.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,918.60 : 191,877.90 = 81,262.60 : x
  2. Step 2: Convert to fraction form
    127,918.60/191,877.90 = 81,262.60/x
  3. Step 3: Cross multiply
    127,918.60x = 191,877.90 × 81,262.60
  4. Step 4: Simplify right side
    127,918.60x = 15,592,497,036.54
  5. Step 5: Solve for x
    x = 15,592,497,036.54/127,918.60
  6. Step 6: Final answer
    x = 121,893.90

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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.