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Finding the Fourth Proportional to 764.88, 1,143.72 and 658.32

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Solution

The fourth proportional to 764.88, 1,143.72 and 658.32 is: 984.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.88 : 1,143.72 = 658.32 : x
  2. Step 2: Convert to fraction form
    764.88/1,143.72 = 658.32/x
  3. Step 3: Cross multiply
    764.88x = 1,143.72 × 658.32
  4. Step 4: Simplify right side
    764.88x = 752,933.75
  5. Step 5: Solve for x
    x = 752,933.75/764.88
  6. Step 6: Final answer
    x = 984.38

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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.