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Finding the Fourth Proportional to 191,791.72, 287,784.78 and 129,331

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Solution

The fourth proportional to 191,791.72, 287,784.78 and 129,331 is: 194,062.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,791.72 : 287,784.78 = 129,331 : x
  2. Step 2: Convert to fraction form
    191,791.72/287,784.78 = 129,331/x
  3. Step 3: Cross multiply
    191,791.72x = 287,784.78 × 129,331
  4. Step 4: Simplify right side
    191,791.72x = 37,219,493,382.18
  5. Step 5: Solve for x
    x = 37,219,493,382.18/191,791.72
  6. Step 6: Final answer
    x = 194,062.04

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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.