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Finding the Fourth Proportional to 64.45, 96.86 and 57.79

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Solution

The fourth proportional to 64.45, 96.86 and 57.79 is: 86.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    64.45 : 96.86 = 57.79 : x
  2. Step 2: Convert to fraction form
    64.45/96.86 = 57.79/x
  3. Step 3: Cross multiply
    64.45x = 96.86 × 57.79
  4. Step 4: Simplify right side
    64.45x = 5,597.54
  5. Step 5: Solve for x
    x = 5,597.54/64.45
  6. Step 6: Final answer
    x = 86.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.