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Finding the Fourth Proportional to 704.30, 971.85 and 393.78

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Solution

The fourth proportional to 704.30, 971.85 and 393.78 is: 543.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.30 : 971.85 = 393.78 : x
  2. Step 2: Convert to fraction form
    704.30/971.85 = 393.78/x
  3. Step 3: Cross multiply
    704.30x = 971.85 × 393.78
  4. Step 4: Simplify right side
    704.30x = 382,695.09
  5. Step 5: Solve for x
    x = 382,695.09/704.30
  6. Step 6: Final answer
    x = 543.37

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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.