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Finding the Fourth Proportional to 556.35, 768.01 and 391.42

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Solution

The fourth proportional to 556.35, 768.01 and 391.42 is: 540.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    556.35 : 768.01 = 391.42 : x
  2. Step 2: Convert to fraction form
    556.35/768.01 = 391.42/x
  3. Step 3: Cross multiply
    556.35x = 768.01 × 391.42
  4. Step 4: Simplify right side
    556.35x = 300,614.47
  5. Step 5: Solve for x
    x = 300,614.47/556.35
  6. Step 6: Final answer
    x = 540.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.