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Finding the Fourth Proportional to 215.05, 322.42 and 91.59

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Solution

The fourth proportional to 215.05, 322.42 and 91.59 is: 137.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.05 : 322.42 = 91.59 : x
  2. Step 2: Convert to fraction form
    215.05/322.42 = 91.59/x
  3. Step 3: Cross multiply
    215.05x = 322.42 × 91.59
  4. Step 4: Simplify right side
    215.05x = 29,529.44
  5. Step 5: Solve for x
    x = 29,529.44/215.05
  6. Step 6: Final answer
    x = 137.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.