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Finding the Fourth Proportional to 216.17, 298.30 and 122.91

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Solution

The fourth proportional to 216.17, 298.30 and 122.91 is: 169.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.17 : 298.30 = 122.91 : x
  2. Step 2: Convert to fraction form
    216.17/298.30 = 122.91/x
  3. Step 3: Cross multiply
    216.17x = 298.30 × 122.91
  4. Step 4: Simplify right side
    216.17x = 36,663.44
  5. Step 5: Solve for x
    x = 36,663.44/216.17
  6. Step 6: Final answer
    x = 169.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.