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Finding the Fourth Proportional to 124.42, 172.70 and 122.70

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Solution

The fourth proportional to 124.42, 172.70 and 122.70 is: 170.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.42 : 172.70 = 122.70 : x
  2. Step 2: Convert to fraction form
    124.42/172.70 = 122.70/x
  3. Step 3: Cross multiply
    124.42x = 172.70 × 122.70
  4. Step 4: Simplify right side
    124.42x = 21,190.29
  5. Step 5: Solve for x
    x = 21,190.29/124.42
  6. Step 6: Final answer
    x = 170.31

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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.