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Finding the Fourth Proportional to 174.16, 240.45 and 121.81

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Solution

The fourth proportional to 174.16, 240.45 and 121.81 is: 168.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    174.16 : 240.45 = 121.81 : x
  2. Step 2: Convert to fraction form
    174.16/240.45 = 121.81/x
  3. Step 3: Cross multiply
    174.16x = 240.45 × 121.81
  4. Step 4: Simplify right side
    174.16x = 29,288.01
  5. Step 5: Solve for x
    x = 29,288.01/174.16
  6. Step 6: Final answer
    x = 168.17

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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.