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Finding the Fourth Proportional to 121.79, 168.10 and 117.94

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Solution

The fourth proportional to 121.79, 168.10 and 117.94 is: 162.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.79 : 168.10 = 117.94 : x
  2. Step 2: Convert to fraction form
    121.79/168.10 = 117.94/x
  3. Step 3: Cross multiply
    121.79x = 168.10 × 117.94
  4. Step 4: Simplify right side
    121.79x = 19,825.71
  5. Step 5: Solve for x
    x = 19,825.71/121.79
  6. Step 6: Final answer
    x = 162.79

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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.