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Finding the Fourth Proportional to 126.88, 175.15 and 77.77

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Solution

The fourth proportional to 126.88, 175.15 and 77.77 is: 107.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.88 : 175.15 = 77.77 : x
  2. Step 2: Convert to fraction form
    126.88/175.15 = 77.77/x
  3. Step 3: Cross multiply
    126.88x = 175.15 × 77.77
  4. Step 4: Simplify right side
    126.88x = 13,621.42
  5. Step 5: Solve for x
    x = 13,621.42/126.88
  6. Step 6: Final answer
    x = 107.36

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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.