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Finding the Fourth Proportional to 76.26, 105.09 and 51.66

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Solution

The fourth proportional to 76.26, 105.09 and 51.66 is: 71.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.26 : 105.09 = 51.66 : x
  2. Step 2: Convert to fraction form
    76.26/105.09 = 51.66/x
  3. Step 3: Cross multiply
    76.26x = 105.09 × 51.66
  4. Step 4: Simplify right side
    76.26x = 5,428.95
  5. Step 5: Solve for x
    x = 5,428.95/76.26
  6. Step 6: Final answer
    x = 71.19

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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.