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Finding the Fourth Proportional to 679, 937.18 and 399.25

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Solution

The fourth proportional to 679, 937.18 and 399.25 is: 551.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    679 : 937.18 = 399.25 : x
  2. Step 2: Convert to fraction form
    679/937.18 = 399.25/x
  3. Step 3: Cross multiply
    679x = 937.18 × 399.25
  4. Step 4: Simplify right side
    679x = 374,169.12
  5. Step 5: Solve for x
    x = 374,169.12/679
  6. Step 6: Final answer
    x = 551.06

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.