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Finding the Fourth Proportional to 114.92, 172.56 and 112.40

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Solution

The fourth proportional to 114.92, 172.56 and 112.40 is: 168.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.92 : 172.56 = 112.40 : x
  2. Step 2: Convert to fraction form
    114.92/172.56 = 112.40/x
  3. Step 3: Cross multiply
    114.92x = 172.56 × 112.40
  4. Step 4: Simplify right side
    114.92x = 19,395.74
  5. Step 5: Solve for x
    x = 19,395.74/114.92
  6. Step 6: Final answer
    x = 168.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.