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Finding the Fourth Proportional to 210, 289.80 and 122.69

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Solution

The fourth proportional to 210, 289.80 and 122.69 is: 169.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    210 : 289.80 = 122.69 : x
  2. Step 2: Convert to fraction form
    210/289.80 = 122.69/x
  3. Step 3: Cross multiply
    210x = 289.80 × 122.69
  4. Step 4: Simplify right side
    210x = 35,554.11
  5. Step 5: Solve for x
    x = 35,554.11/210
  6. Step 6: Final answer
    x = 169.31

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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.