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Finding the Fourth Proportional to 679.42, 937.56 and 380.68

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Solution

The fourth proportional to 679.42, 937.56 and 380.68 is: 525.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.42 : 937.56 = 380.68 : x
  2. Step 2: Convert to fraction form
    679.42/937.56 = 380.68/x
  3. Step 3: Cross multiply
    679.42x = 937.56 × 380.68
  4. Step 4: Simplify right side
    679.42x = 356,910.34
  5. Step 5: Solve for x
    x = 356,910.34/679.42
  6. Step 6: Final answer
    x = 525.32

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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.