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Finding the Fourth Proportional to 126.36, 174.30 and 77.24

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Solution

The fourth proportional to 126.36, 174.30 and 77.24 is: 106.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.36 : 174.30 = 77.24 : x
  2. Step 2: Convert to fraction form
    126.36/174.30 = 77.24/x
  3. Step 3: Cross multiply
    126.36x = 174.30 × 77.24
  4. Step 4: Simplify right side
    126.36x = 13,462.93
  5. Step 5: Solve for x
    x = 13,462.93/126.36
  6. Step 6: Final answer
    x = 106.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.