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Finding the Fourth Proportional to 215.25, 322.18 and 112.39

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Solution

The fourth proportional to 215.25, 322.18 and 112.39 is: 168.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.25 : 322.18 = 112.39 : x
  2. Step 2: Convert to fraction form
    215.25/322.18 = 112.39/x
  3. Step 3: Cross multiply
    215.25x = 322.18 × 112.39
  4. Step 4: Simplify right side
    215.25x = 36,209.81
  5. Step 5: Solve for x
    x = 36,209.81/215.25
  6. Step 6: Final answer
    x = 168.22

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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.