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Finding the Fourth Proportional to 520.44, 718.20 and 287.58

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Solution

The fourth proportional to 520.44, 718.20 and 287.58 is: 396.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.44 : 718.20 = 287.58 : x
  2. Step 2: Convert to fraction form
    520.44/718.20 = 287.58/x
  3. Step 3: Cross multiply
    520.44x = 718.20 × 287.58
  4. Step 4: Simplify right side
    520.44x = 206,539.96
  5. Step 5: Solve for x
    x = 206,539.96/520.44
  6. Step 6: Final answer
    x = 396.86

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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.