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Finding the Fourth Proportional to 518.97, 778.91 and 288.12

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Solution

The fourth proportional to 518.97, 778.91 and 288.12 is: 432.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.97 : 778.91 = 288.12 : x
  2. Step 2: Convert to fraction form
    518.97/778.91 = 288.12/x
  3. Step 3: Cross multiply
    518.97x = 778.91 × 288.12
  4. Step 4: Simplify right side
    518.97x = 224,419.16
  5. Step 5: Solve for x
    x = 224,419.16/518.97
  6. Step 6: Final answer
    x = 432.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.