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Finding the Fourth Proportional to 522.36, 720.90 and 391.14

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Solution

The fourth proportional to 522.36, 720.90 and 391.14 is: 539.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.36 : 720.90 = 391.14 : x
  2. Step 2: Convert to fraction form
    522.36/720.90 = 391.14/x
  3. Step 3: Cross multiply
    522.36x = 720.90 × 391.14
  4. Step 4: Simplify right side
    522.36x = 281,972.83
  5. Step 5: Solve for x
    x = 281,972.83/522.36
  6. Step 6: Final answer
    x = 539.81

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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.