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Finding the Fourth Proportional to 520.35, 718.11 and 287.49

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Solution

The fourth proportional to 520.35, 718.11 and 287.49 is: 396.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.35 : 718.11 = 287.49 : x
  2. Step 2: Convert to fraction form
    520.35/718.11 = 287.49/x
  3. Step 3: Cross multiply
    520.35x = 718.11 × 287.49
  4. Step 4: Simplify right side
    520.35x = 206,449.44
  5. Step 5: Solve for x
    x = 206,449.44/520.35
  6. Step 6: Final answer
    x = 396.75

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.