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Finding the Fourth Proportional to 151.81, 209.70 and 121.14

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Solution

The fourth proportional to 151.81, 209.70 and 121.14 is: 167.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.81 : 209.70 = 121.14 : x
  2. Step 2: Convert to fraction form
    151.81/209.70 = 121.14/x
  3. Step 3: Cross multiply
    151.81x = 209.70 × 121.14
  4. Step 4: Simplify right side
    151.81x = 25,403.06
  5. Step 5: Solve for x
    x = 25,403.06/151.81
  6. Step 6: Final answer
    x = 167.34

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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.