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Finding the Fourth Proportional to 215.09, 322.56 and 91.69

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Solution

The fourth proportional to 215.09, 322.56 and 91.69 is: 137.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.09 : 322.56 = 91.69 : x
  2. Step 2: Convert to fraction form
    215.09/322.56 = 91.69/x
  3. Step 3: Cross multiply
    215.09x = 322.56 × 91.69
  4. Step 4: Simplify right side
    215.09x = 29,575.53
  5. Step 5: Solve for x
    x = 29,575.53/215.09
  6. Step 6: Final answer
    x = 137.50

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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.