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Finding the Fourth Proportional to 191.18, 263.68 and 128.98

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Solution

The fourth proportional to 191.18, 263.68 and 128.98 is: 177.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.18 : 263.68 = 128.98 : x
  2. Step 2: Convert to fraction form
    191.18/263.68 = 128.98/x
  3. Step 3: Cross multiply
    191.18x = 263.68 × 128.98
  4. Step 4: Simplify right side
    191.18x = 34,009.45
  5. Step 5: Solve for x
    x = 34,009.45/191.18
  6. Step 6: Final answer
    x = 177.89

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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.