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Finding the Fourth Proportional to 215.09, 322.58 and 70.82

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Solution

The fourth proportional to 215.09, 322.58 and 70.82 is: 106.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.09 : 322.58 = 70.82 : x
  2. Step 2: Convert to fraction form
    215.09/322.58 = 70.82/x
  3. Step 3: Cross multiply
    215.09x = 322.58 × 70.82
  4. Step 4: Simplify right side
    215.09x = 22,843.68
  5. Step 5: Solve for x
    x = 22,843.68/215.09
  6. Step 6: Final answer
    x = 106.21

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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.