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Finding the Fourth Proportional to 679.93, 938.29 and 369.43

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Solution

The fourth proportional to 679.93, 938.29 and 369.43 is: 509.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.93 : 938.29 = 369.43 : x
  2. Step 2: Convert to fraction form
    679.93/938.29 = 369.43/x
  3. Step 3: Cross multiply
    679.93x = 938.29 × 369.43
  4. Step 4: Simplify right side
    679.93x = 346,629.21
  5. Step 5: Solve for x
    x = 346,629.21/679.93
  6. Step 6: Final answer
    x = 509.80

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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.