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Finding the Fourth Proportional to 155.94, 215.46 and 129.66

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Solution

The fourth proportional to 155.94, 215.46 and 129.66 is: 179.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.94 : 215.46 = 129.66 : x
  2. Step 2: Convert to fraction form
    155.94/215.46 = 129.66/x
  3. Step 3: Cross multiply
    155.94x = 215.46 × 129.66
  4. Step 4: Simplify right side
    155.94x = 27,936.54
  5. Step 5: Solve for x
    x = 27,936.54/155.94
  6. Step 6: Final answer
    x = 179.15

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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.