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Finding the Fourth Proportional to 191.94, 287.97 and 139.43

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Solution

The fourth proportional to 191.94, 287.97 and 139.43 is: 209.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.94 : 287.97 = 139.43 : x
  2. Step 2: Convert to fraction form
    191.94/287.97 = 139.43/x
  3. Step 3: Cross multiply
    191.94x = 287.97 × 139.43
  4. Step 4: Simplify right side
    191.94x = 40,152.46
  5. Step 5: Solve for x
    x = 40,152.46/191.94
  6. Step 6: Final answer
    x = 209.19

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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.