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Finding the Fourth Proportional to 520.30, 718.01 and 287.42

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Solution

The fourth proportional to 520.30, 718.01 and 287.42 is: 396.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.30 : 718.01 = 287.42 : x
  2. Step 2: Convert to fraction form
    520.30/718.01 = 287.42/x
  3. Step 3: Cross multiply
    520.30x = 718.01 × 287.42
  4. Step 4: Simplify right side
    520.30x = 206,372.23
  5. Step 5: Solve for x
    x = 206,372.23/520.30
  6. Step 6: Final answer
    x = 396.64

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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.