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Finding the Fourth Proportional to 191,764.80, 287,906.40 and 121,780.80

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Solution

The fourth proportional to 191,764.80, 287,906.40 and 121,780.80 is: 182,835.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,764.80 : 287,906.40 = 121,780.80 : x
  2. Step 2: Convert to fraction form
    191,764.80/287,906.40 = 121,780.80/x
  3. Step 3: Cross multiply
    191,764.80x = 287,906.40 × 121,780.80
  4. Step 4: Simplify right side
    191,764.80x = 35,061,471,717.12
  5. Step 5: Solve for x
    x = 35,061,471,717.12/191,764.80
  6. Step 6: Final answer
    x = 182,835.81

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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.