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Finding the Fourth Proportional to 155.92, 215.40 and 136.72

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Solution

The fourth proportional to 155.92, 215.40 and 136.72 is: 188.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.92 : 215.40 = 136.72 : x
  2. Step 2: Convert to fraction form
    155.92/215.40 = 136.72/x
  3. Step 3: Cross multiply
    155.92x = 215.40 × 136.72
  4. Step 4: Simplify right side
    155.92x = 29,449.49
  5. Step 5: Solve for x
    x = 29,449.49/155.92
  6. Step 6: Final answer
    x = 188.88

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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.