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Finding the Fourth Proportional to 76.41, 105.66 and 66.24

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Solution

The fourth proportional to 76.41, 105.66 and 66.24 is: 91.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.41 : 105.66 = 66.24 : x
  2. Step 2: Convert to fraction form
    76.41/105.66 = 66.24/x
  3. Step 3: Cross multiply
    76.41x = 105.66 × 66.24
  4. Step 4: Simplify right side
    76.41x = 6,998.92
  5. Step 5: Solve for x
    x = 6,998.92/76.41
  6. Step 6: Final answer
    x = 91.60

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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.