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Finding the Fourth Proportional to 703.78, 971.22 and 393.28

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Solution

The fourth proportional to 703.78, 971.22 and 393.28 is: 542.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    703.78 : 971.22 = 393.28 : x
  2. Step 2: Convert to fraction form
    703.78/971.22 = 393.28/x
  3. Step 3: Cross multiply
    703.78x = 971.22 × 393.28
  4. Step 4: Simplify right side
    703.78x = 381,961.40
  5. Step 5: Solve for x
    x = 381,961.40/703.78
  6. Step 6: Final answer
    x = 542.73

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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.