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Finding the Fourth Proportional to 518.96, 715.74 and 378.92

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Solution

The fourth proportional to 518.96, 715.74 and 378.92 is: 522.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.96 : 715.74 = 378.92 : x
  2. Step 2: Convert to fraction form
    518.96/715.74 = 378.92/x
  3. Step 3: Cross multiply
    518.96x = 715.74 × 378.92
  4. Step 4: Simplify right side
    518.96x = 271,208.20
  5. Step 5: Solve for x
    x = 271,208.20/518.96
  6. Step 6: Final answer
    x = 522.60

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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.