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Finding the Fourth Proportional to 76.57, 105.64 and 45.49

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Solution

The fourth proportional to 76.57, 105.64 and 45.49 is: 62.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.57 : 105.64 = 45.49 : x
  2. Step 2: Convert to fraction form
    76.57/105.64 = 45.49/x
  3. Step 3: Cross multiply
    76.57x = 105.64 × 45.49
  4. Step 4: Simplify right side
    76.57x = 4,805.56
  5. Step 5: Solve for x
    x = 4,805.56/76.57
  6. Step 6: Final answer
    x = 62.76

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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.