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Finding the Fourth Proportional to 124.40, 170.56 and 122.21

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Solution

The fourth proportional to 124.40, 170.56 and 122.21 is: 167.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.40 : 170.56 = 122.21 : x
  2. Step 2: Convert to fraction form
    124.40/170.56 = 122.21/x
  3. Step 3: Cross multiply
    124.40x = 170.56 × 122.21
  4. Step 4: Simplify right side
    124.40x = 20,842.98
  5. Step 5: Solve for x
    x = 20,842.98/124.40
  6. Step 6: Final answer
    x = 167.55

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.