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Finding the Fourth Proportional to 522.39, 781.97 and 278.31

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Solution

The fourth proportional to 522.39, 781.97 and 278.31 is: 416.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.39 : 781.97 = 278.31 : x
  2. Step 2: Convert to fraction form
    522.39/781.97 = 278.31/x
  3. Step 3: Cross multiply
    522.39x = 781.97 × 278.31
  4. Step 4: Simplify right side
    522.39x = 217,628.68
  5. Step 5: Solve for x
    x = 217,628.68/522.39
  6. Step 6: Final answer
    x = 416.60

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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.