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Finding the Fourth Proportional to 518.92, 715.30 and 378.84

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Solution

The fourth proportional to 518.92, 715.30 and 378.84 is: 522.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.92 : 715.30 = 378.84 : x
  2. Step 2: Convert to fraction form
    518.92/715.30 = 378.84/x
  3. Step 3: Cross multiply
    518.92x = 715.30 × 378.84
  4. Step 4: Simplify right side
    518.92x = 270,984.25
  5. Step 5: Solve for x
    x = 270,984.25/518.92
  6. Step 6: Final answer
    x = 522.21

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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.