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Finding the Fourth Proportional to 520.72, 718.56 and 287.83

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Solution

The fourth proportional to 520.72, 718.56 and 287.83 is: 397.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.72 : 718.56 = 287.83 : x
  2. Step 2: Convert to fraction form
    520.72/718.56 = 287.83/x
  3. Step 3: Cross multiply
    520.72x = 718.56 × 287.83
  4. Step 4: Simplify right side
    520.72x = 206,823.12
  5. Step 5: Solve for x
    x = 206,823.12/520.72
  6. Step 6: Final answer
    x = 397.19

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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.