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Finding the Fourth Proportional to 215.34, 323.01 and 61.28

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Solution

The fourth proportional to 215.34, 323.01 and 61.28 is: 91.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.34 : 323.01 = 61.28 : x
  2. Step 2: Convert to fraction form
    215.34/323.01 = 61.28/x
  3. Step 3: Cross multiply
    215.34x = 323.01 × 61.28
  4. Step 4: Simplify right side
    215.34x = 19,792.44
  5. Step 5: Solve for x
    x = 19,792.44/215.34
  6. Step 6: Final answer
    x = 91.91

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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.