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Finding the Fourth Proportional to 520.81, 718.73 and 287.94

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Solution

The fourth proportional to 520.81, 718.73 and 287.94 is: 397.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.81 : 718.73 = 287.94 : x
  2. Step 2: Convert to fraction form
    520.81/718.73 = 287.94/x
  3. Step 3: Cross multiply
    520.81x = 718.73 × 287.94
  4. Step 4: Simplify right side
    520.81x = 206,951.12
  5. Step 5: Solve for x
    x = 206,951.12/520.81
  6. Step 6: Final answer
    x = 397.36

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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.