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Finding the Fourth Proportional to 520.05, 717.66 and 287.18

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Solution

The fourth proportional to 520.05, 717.66 and 287.18 is: 396.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.05 : 717.66 = 287.18 : x
  2. Step 2: Convert to fraction form
    520.05/717.66 = 287.18/x
  3. Step 3: Cross multiply
    520.05x = 717.66 × 287.18
  4. Step 4: Simplify right side
    520.05x = 206,097.60
  5. Step 5: Solve for x
    x = 206,097.60/520.05
  6. Step 6: Final answer
    x = 396.30

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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.