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Finding the Fourth Proportional to 191.02, 263.48 and 121.17

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Solution

The fourth proportional to 191.02, 263.48 and 121.17 is: 167.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    191.02 : 263.48 = 121.17 : x
  2. Step 2: Convert to fraction form
    191.02/263.48 = 121.17/x
  3. Step 3: Cross multiply
    191.02x = 263.48 × 121.17
  4. Step 4: Simplify right side
    191.02x = 31,925.87
  5. Step 5: Solve for x
    x = 31,925.87/191.02
  6. Step 6: Final answer
    x = 167.13

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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.