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Finding the Fourth Proportional to 518.15, 715.13 and 393.61

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Solution

The fourth proportional to 518.15, 715.13 and 393.61 is: 543.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.15 : 715.13 = 393.61 : x
  2. Step 2: Convert to fraction form
    518.15/715.13 = 393.61/x
  3. Step 3: Cross multiply
    518.15x = 715.13 × 393.61
  4. Step 4: Simplify right side
    518.15x = 281,476.78
  5. Step 5: Solve for x
    x = 281,476.78/518.15
  6. Step 6: Final answer
    x = 543.23

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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.