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Finding the Fourth Proportional to 191.15, 263.96 and 138.98

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Solution

The fourth proportional to 191.15, 263.96 and 138.98 is: 191.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.15 : 263.96 = 138.98 : x
  2. Step 2: Convert to fraction form
    191.15/263.96 = 138.98/x
  3. Step 3: Cross multiply
    191.15x = 263.96 × 138.98
  4. Step 4: Simplify right side
    191.15x = 36,684.47
  5. Step 5: Solve for x
    x = 36,684.47/191.15
  6. Step 6: Final answer
    x = 191.91

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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.