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Finding the Fourth Proportional to 126.87, 174.99 and 85.35

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Solution

The fourth proportional to 126.87, 174.99 and 85.35 is: 117.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.87 : 174.99 = 85.35 : x
  2. Step 2: Convert to fraction form
    126.87/174.99 = 85.35/x
  3. Step 3: Cross multiply
    126.87x = 174.99 × 85.35
  4. Step 4: Simplify right side
    126.87x = 14,936.37
  5. Step 5: Solve for x
    x = 14,936.37/126.87
  6. Step 6: Final answer
    x = 117.73

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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.