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Finding the Fourth Proportional to 520.83, 718.74 and 287.96

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Solution

The fourth proportional to 520.83, 718.74 and 287.96 is: 397.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.83 : 718.74 = 287.96 : x
  2. Step 2: Convert to fraction form
    520.83/718.74 = 287.96/x
  3. Step 3: Cross multiply
    520.83x = 718.74 × 287.96
  4. Step 4: Simplify right side
    520.83x = 206,964.78
  5. Step 5: Solve for x
    x = 206,964.78/520.83
  6. Step 6: Final answer
    x = 397.37

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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.