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Finding the Fourth Proportional to 155.41, 215.89 and 153.97

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Solution

The fourth proportional to 155.41, 215.89 and 153.97 is: 213.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.41 : 215.89 = 153.97 : x
  2. Step 2: Convert to fraction form
    155.41/215.89 = 153.97/x
  3. Step 3: Cross multiply
    155.41x = 215.89 × 153.97
  4. Step 4: Simplify right side
    155.41x = 33,240.58
  5. Step 5: Solve for x
    x = 33,240.58/155.41
  6. Step 6: Final answer
    x = 213.89

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.