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Finding the Fourth Proportional to 520.22, 717.90 and 287.30

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Solution

The fourth proportional to 520.22, 717.90 and 287.30 is: 396.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.22 : 717.90 = 287.30 : x
  2. Step 2: Convert to fraction form
    520.22/717.90 = 287.30/x
  3. Step 3: Cross multiply
    520.22x = 717.90 × 287.30
  4. Step 4: Simplify right side
    520.22x = 206,252.67
  5. Step 5: Solve for x
    x = 206,252.67/520.22
  6. Step 6: Final answer
    x = 396.47

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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.