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Finding the Fourth Proportional to 680.50, 939.06 and 381.77

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Solution

The fourth proportional to 680.50, 939.06 and 381.77 is: 526.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.50 : 939.06 = 381.77 : x
  2. Step 2: Convert to fraction form
    680.50/939.06 = 381.77/x
  3. Step 3: Cross multiply
    680.50x = 939.06 × 381.77
  4. Step 4: Simplify right side
    680.50x = 358,504.94
  5. Step 5: Solve for x
    x = 358,504.94/680.50
  6. Step 6: Final answer
    x = 526.83

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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.