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Finding the Fourth Proportional to 126.15, 174.82 and 123.72

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Solution

The fourth proportional to 126.15, 174.82 and 123.72 is: 171.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.15 : 174.82 = 123.72 : x
  2. Step 2: Convert to fraction form
    126.15/174.82 = 123.72/x
  3. Step 3: Cross multiply
    126.15x = 174.82 × 123.72
  4. Step 4: Simplify right side
    126.15x = 21,628.42
  5. Step 5: Solve for x
    x = 21,628.42/126.15
  6. Step 6: Final answer
    x = 171.45

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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.