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Finding the Fourth Proportional to 792.87, 1,189.50 and 640.18

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Solution

The fourth proportional to 792.87, 1,189.50 and 640.18 is: 960.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.87 : 1,189.50 = 640.18 : x
  2. Step 2: Convert to fraction form
    792.87/1,189.50 = 640.18/x
  3. Step 3: Cross multiply
    792.87x = 1,189.50 × 640.18
  4. Step 4: Simplify right side
    792.87x = 761,494.11
  5. Step 5: Solve for x
    x = 761,494.11/792.87
  6. Step 6: Final answer
    x = 960.43

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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.