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Finding the Fourth Proportional to 123.58, 171.25 and 122.10

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Solution

The fourth proportional to 123.58, 171.25 and 122.10 is: 169.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.58 : 171.25 = 122.10 : x
  2. Step 2: Convert to fraction form
    123.58/171.25 = 122.10/x
  3. Step 3: Cross multiply
    123.58x = 171.25 × 122.10
  4. Step 4: Simplify right side
    123.58x = 20,909.63
  5. Step 5: Solve for x
    x = 20,909.63/123.58
  6. Step 6: Final answer
    x = 169.20

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.