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Finding the Fourth Proportional to 191.63, 286.39 and 140.40

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Solution

The fourth proportional to 191.63, 286.39 and 140.40 is: 209.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.63 : 286.39 = 140.40 : x
  2. Step 2: Convert to fraction form
    191.63/286.39 = 140.40/x
  3. Step 3: Cross multiply
    191.63x = 286.39 × 140.40
  4. Step 4: Simplify right side
    191.63x = 40,208.54
  5. Step 5: Solve for x
    x = 40,208.54/191.63
  6. Step 6: Final answer
    x = 209.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.