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Finding the Fourth Proportional to 704.78, 972.60 and 394.28

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Solution

The fourth proportional to 704.78, 972.60 and 394.28 is: 544.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.78 : 972.60 = 394.28 : x
  2. Step 2: Convert to fraction form
    704.78/972.60 = 394.28/x
  3. Step 3: Cross multiply
    704.78x = 972.60 × 394.28
  4. Step 4: Simplify right side
    704.78x = 383,476.73
  5. Step 5: Solve for x
    x = 383,476.73/704.78
  6. Step 6: Final answer
    x = 544.11

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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.