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Finding the Fourth Proportional to 714.72, 986.21 and 399.95

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Solution

The fourth proportional to 714.72, 986.21 and 399.95 is: 551.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.72 : 986.21 = 399.95 : x
  2. Step 2: Convert to fraction form
    714.72/986.21 = 399.95/x
  3. Step 3: Cross multiply
    714.72x = 986.21 × 399.95
  4. Step 4: Simplify right side
    714.72x = 394,434.69
  5. Step 5: Solve for x
    x = 394,434.69/714.72
  6. Step 6: Final answer
    x = 551.87

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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.