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Finding the Fourth Proportional to 122.10, 171.30 and 122.10

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Solution

The fourth proportional to 122.10, 171.30 and 122.10 is: 171.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    122.10 : 171.30 = 122.10 : x
  2. Step 2: Convert to fraction form
    122.10/171.30 = 122.10/x
  3. Step 3: Cross multiply
    122.10x = 171.30 × 122.10
  4. Step 4: Simplify right side
    122.10x = 20,915.73
  5. Step 5: Solve for x
    x = 20,915.73/122.10
  6. Step 6: Final answer
    x = 171.30

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.