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Finding the Fourth Proportional to 520.10, 717.74 and 287.24

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Solution

The fourth proportional to 520.10, 717.74 and 287.24 is: 396.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.10 : 717.74 = 287.24 : x
  2. Step 2: Convert to fraction form
    520.10/717.74 = 287.24/x
  3. Step 3: Cross multiply
    520.10x = 717.74 × 287.24
  4. Step 4: Simplify right side
    520.10x = 206,163.64
  5. Step 5: Solve for x
    x = 206,163.64/520.10
  6. Step 6: Final answer
    x = 396.39

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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.