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Finding the Fourth Proportional to 518.43, 715.11 and 378.71

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Solution

The fourth proportional to 518.43, 715.11 and 378.71 is: 522.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.43 : 715.11 = 378.71 : x
  2. Step 2: Convert to fraction form
    518.43/715.11 = 378.71/x
  3. Step 3: Cross multiply
    518.43x = 715.11 × 378.71
  4. Step 4: Simplify right side
    518.43x = 270,815.73
  5. Step 5: Solve for x
    x = 270,815.73/518.43
  6. Step 6: Final answer
    x = 522.38

Related Problems

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Double scale
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Similar ratio
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1.5x scale

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.