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Finding the Fourth Proportional to 191.48, 264.31 and 121.57

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Solution

The fourth proportional to 191.48, 264.31 and 121.57 is: 167.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.48 : 264.31 = 121.57 : x
  2. Step 2: Convert to fraction form
    191.48/264.31 = 121.57/x
  3. Step 3: Cross multiply
    191.48x = 264.31 × 121.57
  4. Step 4: Simplify right side
    191.48x = 32,132.17
  5. Step 5: Solve for x
    x = 32,132.17/191.48
  6. Step 6: Final answer
    x = 167.81

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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.