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Finding the Fourth Proportional to 76.66, 105.78 and 45.57

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Solution

The fourth proportional to 76.66, 105.78 and 45.57 is: 62.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.66 : 105.78 = 45.57 : x
  2. Step 2: Convert to fraction form
    76.66/105.78 = 45.57/x
  3. Step 3: Cross multiply
    76.66x = 105.78 × 45.57
  4. Step 4: Simplify right side
    76.66x = 4,820.96
  5. Step 5: Solve for x
    x = 4,820.96/76.66
  6. Step 6: Final answer
    x = 62.89

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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.