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Finding the Fourth Proportional to 191.59, 264.30 and 121.66

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Solution

The fourth proportional to 191.59, 264.30 and 121.66 is: 167.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.59 : 264.30 = 121.66 : x
  2. Step 2: Convert to fraction form
    191.59/264.30 = 121.66/x
  3. Step 3: Cross multiply
    191.59x = 264.30 × 121.66
  4. Step 4: Simplify right side
    191.59x = 32,154.74
  5. Step 5: Solve for x
    x = 32,154.74/191.59
  6. Step 6: Final answer
    x = 167.83

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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.