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Finding the Fourth Proportional to 127,902.80, 191,940.60 and 83,421.20

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Solution

The fourth proportional to 127,902.80, 191,940.60 and 83,421.20 is: 125,188.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,902.80 : 191,940.60 = 83,421.20 : x
  2. Step 2: Convert to fraction form
    127,902.80/191,940.60 = 83,421.20/x
  3. Step 3: Cross multiply
    127,902.80x = 191,940.60 × 83,421.20
  4. Step 4: Simplify right side
    127,902.80x = 16,011,915,180.72
  5. Step 5: Solve for x
    x = 16,011,915,180.72/127,902.80
  6. Step 6: Final answer
    x = 125,188.15

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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.