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Finding the Fourth Proportional to 714.60, 986.10 and 399.84

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Solution

The fourth proportional to 714.60, 986.10 and 399.84 is: 551.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.60 : 986.10 = 399.84 : x
  2. Step 2: Convert to fraction form
    714.60/986.10 = 399.84/x
  3. Step 3: Cross multiply
    714.60x = 986.10 × 399.84
  4. Step 4: Simplify right side
    714.60x = 394,282.22
  5. Step 5: Solve for x
    x = 394,282.22/714.60
  6. Step 6: Final answer
    x = 551.75

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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.