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Finding the Fourth Proportional to 679.16, 937.16 and 399.48

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Solution

The fourth proportional to 679.16, 937.16 and 399.48 is: 551.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.16 : 937.16 = 399.48 : x
  2. Step 2: Convert to fraction form
    679.16/937.16 = 399.48/x
  3. Step 3: Cross multiply
    679.16x = 937.16 × 399.48
  4. Step 4: Simplify right side
    679.16x = 374,376.68
  5. Step 5: Solve for x
    x = 374,376.68/679.16
  6. Step 6: Final answer
    x = 551.23

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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.