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Finding the Fourth Proportional to 679.94, 938.23 and 381.21

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Solution

The fourth proportional to 679.94, 938.23 and 381.21 is: 526.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.94 : 938.23 = 381.21 : x
  2. Step 2: Convert to fraction form
    679.94/938.23 = 381.21/x
  3. Step 3: Cross multiply
    679.94x = 938.23 × 381.21
  4. Step 4: Simplify right side
    679.94x = 357,660.33
  5. Step 5: Solve for x
    x = 357,660.33/679.94
  6. Step 6: Final answer
    x = 526.01

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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.