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Finding the Fourth Proportional to 191.10, 263.69 and 108.21

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Solution

The fourth proportional to 191.10, 263.69 and 108.21 is: 149.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.10 : 263.69 = 108.21 : x
  2. Step 2: Convert to fraction form
    191.10/263.69 = 108.21/x
  3. Step 3: Cross multiply
    191.10x = 263.69 × 108.21
  4. Step 4: Simplify right side
    191.10x = 28,534.17
  5. Step 5: Solve for x
    x = 28,534.17/191.10
  6. Step 6: Final answer
    x = 149.31

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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.