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Finding the Fourth Proportional to 766.00, 1,145.78 and 645.67

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Solution

The fourth proportional to 766.00, 1,145.78 and 645.67 is: 965.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.00 : 1,145.78 = 645.67 : x
  2. Step 2: Convert to fraction form
    766.00/1,145.78 = 645.67/x
  3. Step 3: Cross multiply
    766.00x = 1,145.78 × 645.67
  4. Step 4: Simplify right side
    766.00x = 739,789.68
  5. Step 5: Solve for x
    x = 739,789.68/766.00
  6. Step 6: Final answer
    x = 965.79

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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.