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Finding the Fourth Proportional to 126.15, 172.81 and 124.43

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Solution

The fourth proportional to 126.15, 172.81 and 124.43 is: 170.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.15 : 172.81 = 124.43 : x
  2. Step 2: Convert to fraction form
    126.15/172.81 = 124.43/x
  3. Step 3: Cross multiply
    126.15x = 172.81 × 124.43
  4. Step 4: Simplify right side
    126.15x = 21,502.75
  5. Step 5: Solve for x
    x = 21,502.75/126.15
  6. Step 6: Final answer
    x = 170.45

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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.