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Finding the Fourth Proportional to 511.47, 768.21 and 438.93

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Solution

The fourth proportional to 511.47, 768.21 and 438.93 is: 659.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    511.47 : 768.21 = 438.93 : x
  2. Step 2: Convert to fraction form
    511.47/768.21 = 438.93/x
  3. Step 3: Cross multiply
    511.47x = 768.21 × 438.93
  4. Step 4: Simplify right side
    511.47x = 337,190.42
  5. Step 5: Solve for x
    x = 337,190.42/511.47
  6. Step 6: Final answer
    x = 659.26

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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.