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Finding the Fourth Proportional to 210.18, 289.94 and 122.82

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Solution

The fourth proportional to 210.18, 289.94 and 122.82 is: 169.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    210.18 : 289.94 = 122.82 : x
  2. Step 2: Convert to fraction form
    210.18/289.94 = 122.82/x
  3. Step 3: Cross multiply
    210.18x = 289.94 × 122.82
  4. Step 4: Simplify right side
    210.18x = 35,609.82
  5. Step 5: Solve for x
    x = 35,609.82/210.18
  6. Step 6: Final answer
    x = 169.43

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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.