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Finding the Fourth Proportional to 215.48, 322.79 and 111.35

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Solution

The fourth proportional to 215.48, 322.79 and 111.35 is: 166.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.48 : 322.79 = 111.35 : x
  2. Step 2: Convert to fraction form
    215.48/322.79 = 111.35/x
  3. Step 3: Cross multiply
    215.48x = 322.79 × 111.35
  4. Step 4: Simplify right side
    215.48x = 35,942.92
  5. Step 5: Solve for x
    x = 35,942.92/215.48
  6. Step 6: Final answer
    x = 166.80

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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.