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Finding the Fourth Proportional to 679.25, 937.06 and 399.51

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Solution

The fourth proportional to 679.25, 937.06 and 399.51 is: 551.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.25 : 937.06 = 399.51 : x
  2. Step 2: Convert to fraction form
    679.25/937.06 = 399.51/x
  3. Step 3: Cross multiply
    679.25x = 937.06 × 399.51
  4. Step 4: Simplify right side
    679.25x = 374,363.84
  5. Step 5: Solve for x
    x = 374,363.84/679.25
  6. Step 6: Final answer
    x = 551.14

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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.