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Finding the Fourth Proportional to 679.71, 938.12 and 384.92

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Solution

The fourth proportional to 679.71, 938.12 and 384.92 is: 531.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.71 : 938.12 = 384.92 : x
  2. Step 2: Convert to fraction form
    679.71/938.12 = 384.92/x
  3. Step 3: Cross multiply
    679.71x = 938.12 × 384.92
  4. Step 4: Simplify right side
    679.71x = 361,098.05
  5. Step 5: Solve for x
    x = 361,098.05/679.71
  6. Step 6: Final answer
    x = 531.25

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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.