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Finding the Fourth Proportional to 215.22, 322.56 and 138

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Solution

The fourth proportional to 215.22, 322.56 and 138 is: 206.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.22 : 322.56 = 138 : x
  2. Step 2: Convert to fraction form
    215.22/322.56 = 138/x
  3. Step 3: Cross multiply
    215.22x = 322.56 × 138
  4. Step 4: Simplify right side
    215.22x = 44,513.28
  5. Step 5: Solve for x
    x = 44,513.28/215.22
  6. Step 6: Final answer
    x = 206.83

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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.