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Finding the Fourth Proportional to 191.01, 286.65 and 139.71

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Solution

The fourth proportional to 191.01, 286.65 and 139.71 is: 209.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.01 : 286.65 = 139.71 : x
  2. Step 2: Convert to fraction form
    191.01/286.65 = 139.71/x
  3. Step 3: Cross multiply
    191.01x = 286.65 × 139.71
  4. Step 4: Simplify right side
    191.01x = 40,047.87
  5. Step 5: Solve for x
    x = 40,047.87/191.01
  6. Step 6: Final answer
    x = 209.66

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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.