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Finding the Fourth Proportional to 679.81, 937.96 and 400.05

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Solution

The fourth proportional to 679.81, 937.96 and 400.05 is: 551.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.81 : 937.96 = 400.05 : x
  2. Step 2: Convert to fraction form
    679.81/937.96 = 400.05/x
  3. Step 3: Cross multiply
    679.81x = 937.96 × 400.05
  4. Step 4: Simplify right side
    679.81x = 375,230.90
  5. Step 5: Solve for x
    x = 375,230.90/679.81
  6. Step 6: Final answer
    x = 551.96

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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.