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Finding the Fourth Proportional to 191, 263.40 and 128.86

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Solution

The fourth proportional to 191, 263.40 and 128.86 is: 177.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    191 : 263.40 = 128.86 : x
  2. Step 2: Convert to fraction form
    191/263.40 = 128.86/x
  3. Step 3: Cross multiply
    191x = 263.40 × 128.86
  4. Step 4: Simplify right side
    191x = 33,941.72
  5. Step 5: Solve for x
    x = 33,941.72/191
  6. Step 6: Final answer
    x = 177.71

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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.