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Finding the Fourth Proportional to 191.07, 263.43 and 138.69

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Solution

The fourth proportional to 191.07, 263.43 and 138.69 is: 191.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.07 : 263.43 = 138.69 : x
  2. Step 2: Convert to fraction form
    191.07/263.43 = 138.69/x
  3. Step 3: Cross multiply
    191.07x = 263.43 × 138.69
  4. Step 4: Simplify right side
    191.07x = 36,535.11
  5. Step 5: Solve for x
    x = 36,535.11/191.07
  6. Step 6: Final answer
    x = 191.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.