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Finding the Fourth Proportional to 518.25, 714.87 and 393.78

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Solution

The fourth proportional to 518.25, 714.87 and 393.78 is: 543.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.25 : 714.87 = 393.78 : x
  2. Step 2: Convert to fraction form
    518.25/714.87 = 393.78/x
  3. Step 3: Cross multiply
    518.25x = 714.87 × 393.78
  4. Step 4: Simplify right side
    518.25x = 281,501.51
  5. Step 5: Solve for x
    x = 281,501.51/518.25
  6. Step 6: Final answer
    x = 543.18

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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.