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Finding the Fourth Proportional to 191,914.80, 288,131.40 and 121,930.80

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Solution

The fourth proportional to 191,914.80, 288,131.40 and 121,930.80 is: 183,060.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,914.80 : 288,131.40 = 121,930.80 : x
  2. Step 2: Convert to fraction form
    191,914.80/288,131.40 = 121,930.80/x
  3. Step 3: Cross multiply
    191,914.80x = 288,131.40 × 121,930.80
  4. Step 4: Simplify right side
    191,914.80x = 35,132,092,107.12
  5. Step 5: Solve for x
    x = 35,132,092,107.12/191,914.80
  6. Step 6: Final answer
    x = 183,060.88

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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.