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Finding the Fourth Proportional to 121.92, 181.44 and 117.92

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Solution

The fourth proportional to 121.92, 181.44 and 117.92 is: 175.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.92 : 181.44 = 117.92 : x
  2. Step 2: Convert to fraction form
    121.92/181.44 = 117.92/x
  3. Step 3: Cross multiply
    121.92x = 181.44 × 117.92
  4. Step 4: Simplify right side
    121.92x = 21,395.40
  5. Step 5: Solve for x
    x = 21,395.40/121.92
  6. Step 6: Final answer
    x = 175.49

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.