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Finding the Fourth Proportional to 191.17, 263.80 and 107.15

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Solution

The fourth proportional to 191.17, 263.80 and 107.15 is: 147.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.17 : 263.80 = 107.15 : x
  2. Step 2: Convert to fraction form
    191.17/263.80 = 107.15/x
  3. Step 3: Cross multiply
    191.17x = 263.80 × 107.15
  4. Step 4: Simplify right side
    191.17x = 28,264.58
  5. Step 5: Solve for x
    x = 28,264.58/191.17
  6. Step 6: Final answer
    x = 147.85

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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.