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Finding the Fourth Proportional to 714.57, 986.09 and 399.86

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Solution

The fourth proportional to 714.57, 986.09 and 399.86 is: 551.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.57 : 986.09 = 399.86 : x
  2. Step 2: Convert to fraction form
    714.57/986.09 = 399.86/x
  3. Step 3: Cross multiply
    714.57x = 986.09 × 399.86
  4. Step 4: Simplify right side
    714.57x = 394,297.95
  5. Step 5: Solve for x
    x = 394,297.95/714.57
  6. Step 6: Final answer
    x = 551.80

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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.