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Finding the Fourth Proportional to 126.65, 174.75 and 74.89

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Solution

The fourth proportional to 126.65, 174.75 and 74.89 is: 103.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.65 : 174.75 = 74.89 : x
  2. Step 2: Convert to fraction form
    126.65/174.75 = 74.89/x
  3. Step 3: Cross multiply
    126.65x = 174.75 × 74.89
  4. Step 4: Simplify right side
    126.65x = 13,086.65
  5. Step 5: Solve for x
    x = 13,086.65/126.65
  6. Step 6: Final answer
    x = 103.33

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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.