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Finding the Fourth Proportional to 768.07, 1,150.41 and 438.25

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Solution

The fourth proportional to 768.07, 1,150.41 and 438.25 is: 656.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.07 : 1,150.41 = 438.25 : x
  2. Step 2: Convert to fraction form
    768.07/1,150.41 = 438.25/x
  3. Step 3: Cross multiply
    768.07x = 1,150.41 × 438.25
  4. Step 4: Simplify right side
    768.07x = 504,167.18
  5. Step 5: Solve for x
    x = 504,167.18/768.07
  6. Step 6: Final answer
    x = 656.41

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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.