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Finding the Fourth Proportional to 680.18, 938.70 and 381.46

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Solution

The fourth proportional to 680.18, 938.70 and 381.46 is: 526.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.18 : 938.70 = 381.46 : x
  2. Step 2: Convert to fraction form
    680.18/938.70 = 381.46/x
  3. Step 3: Cross multiply
    680.18x = 938.70 × 381.46
  4. Step 4: Simplify right side
    680.18x = 358,076.45
  5. Step 5: Solve for x
    x = 358,076.45/680.18
  6. Step 6: Final answer
    x = 526.44

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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.