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Finding the Fourth Proportional to 679.76, 937.91 and 399.93

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Solution

The fourth proportional to 679.76, 937.91 and 399.93 is: 551.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.76 : 937.91 = 399.93 : x
  2. Step 2: Convert to fraction form
    679.76/937.91 = 399.93/x
  3. Step 3: Cross multiply
    679.76x = 937.91 × 399.93
  4. Step 4: Simplify right side
    679.76x = 375,098.35
  5. Step 5: Solve for x
    x = 375,098.35/679.76
  6. Step 6: Final answer
    x = 551.81

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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.