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Finding the Fourth Proportional to 215.25, 322.63 and 138.03

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Solution

The fourth proportional to 215.25, 322.63 and 138.03 is: 206.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.25 : 322.63 = 138.03 : x
  2. Step 2: Convert to fraction form
    215.25/322.63 = 138.03/x
  3. Step 3: Cross multiply
    215.25x = 322.63 × 138.03
  4. Step 4: Simplify right side
    215.25x = 44,532.62
  5. Step 5: Solve for x
    x = 44,532.62/215.25
  6. Step 6: Final answer
    x = 206.89

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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.