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Finding the Fourth Proportional to 680.61, 939.20 and 385.83

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Solution

The fourth proportional to 680.61, 939.20 and 385.83 is: 532.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.61 : 939.20 = 385.83 : x
  2. Step 2: Convert to fraction form
    680.61/939.20 = 385.83/x
  3. Step 3: Cross multiply
    680.61x = 939.20 × 385.83
  4. Step 4: Simplify right side
    680.61x = 362,369.61
  5. Step 5: Solve for x
    x = 362,369.61/680.61
  6. Step 6: Final answer
    x = 532.42

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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.