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Finding the Fourth Proportional to 191,791.80, 287,687.70 and 67,145.40

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Solution

The fourth proportional to 191,791.80, 287,687.70 and 67,145.40 is: 100,718.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    191,791.80 : 287,687.70 = 67,145.40 : x
  2. Step 2: Convert to fraction form
    191,791.80/287,687.70 = 67,145.40/x
  3. Step 3: Cross multiply
    191,791.80x = 287,687.70 × 67,145.40
  4. Step 4: Simplify right side
    191,791.80x = 19,316,905,691.58
  5. Step 5: Solve for x
    x = 19,316,905,691.58/191,791.80
  6. Step 6: Final answer
    x = 100,718.10

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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.