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Finding the Fourth Proportional to 76.68, 105.73 and 64.38

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Solution

The fourth proportional to 76.68, 105.73 and 64.38 is: 88.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.68 : 105.73 = 64.38 : x
  2. Step 2: Convert to fraction form
    76.68/105.73 = 64.38/x
  3. Step 3: Cross multiply
    76.68x = 105.73 × 64.38
  4. Step 4: Simplify right side
    76.68x = 6,806.74
  5. Step 5: Solve for x
    x = 6,806.74/76.68
  6. Step 6: Final answer
    x = 88.77

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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.