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Finding the Fourth Proportional to 155.92, 215.04 and 121.36

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Solution

The fourth proportional to 155.92, 215.04 and 121.36 is: 167.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.92 : 215.04 = 121.36 : x
  2. Step 2: Convert to fraction form
    155.92/215.04 = 121.36/x
  3. Step 3: Cross multiply
    155.92x = 215.04 × 121.36
  4. Step 4: Simplify right side
    155.92x = 26,097.25
  5. Step 5: Solve for x
    x = 26,097.25/155.92
  6. Step 6: Final answer
    x = 167.38

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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.