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Finding the Fourth Proportional to 215.82, 321.62 and 215.46

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Solution

The fourth proportional to 215.82, 321.62 and 215.46 is: 321.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.82 : 321.62 = 215.46 : x
  2. Step 2: Convert to fraction form
    215.82/321.62 = 215.46/x
  3. Step 3: Cross multiply
    215.82x = 321.62 × 215.46
  4. Step 4: Simplify right side
    215.82x = 69,295.17
  5. Step 5: Solve for x
    x = 69,295.17/215.82
  6. Step 6: Final answer
    x = 321.08

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.