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Finding the Fourth Proportional to 191.01, 263.54 and 128.91

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Solution

The fourth proportional to 191.01, 263.54 and 128.91 is: 177.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.01 : 263.54 = 128.91 : x
  2. Step 2: Convert to fraction form
    191.01/263.54 = 128.91/x
  3. Step 3: Cross multiply
    191.01x = 263.54 × 128.91
  4. Step 4: Simplify right side
    191.01x = 33,972.30
  5. Step 5: Solve for x
    x = 33,972.30/191.01
  6. Step 6: Final answer
    x = 177.86

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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.