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Finding the Fourth Proportional to 520.19, 717.86 and 287.32

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Solution

The fourth proportional to 520.19, 717.86 and 287.32 is: 396.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.19 : 717.86 = 287.32 : x
  2. Step 2: Convert to fraction form
    520.19/717.86 = 287.32/x
  3. Step 3: Cross multiply
    520.19x = 717.86 × 287.32
  4. Step 4: Simplify right side
    520.19x = 206,251.95
  5. Step 5: Solve for x
    x = 206,251.95/520.19
  6. Step 6: Final answer
    x = 396.49

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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.