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Finding the Fourth Proportional to 76.69, 105.81 and 45.60

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Solution

The fourth proportional to 76.69, 105.81 and 45.60 is: 62.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.69 : 105.81 = 45.60 : x
  2. Step 2: Convert to fraction form
    76.69/105.81 = 45.60/x
  3. Step 3: Cross multiply
    76.69x = 105.81 × 45.60
  4. Step 4: Simplify right side
    76.69x = 4,824.94
  5. Step 5: Solve for x
    x = 4,824.94/76.69
  6. Step 6: Final answer
    x = 62.91

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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.