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Finding the Fourth Proportional to 704.18, 971.77 and 393.68

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Solution

The fourth proportional to 704.18, 971.77 and 393.68 is: 543.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.18 : 971.77 = 393.68 : x
  2. Step 2: Convert to fraction form
    704.18/971.77 = 393.68/x
  3. Step 3: Cross multiply
    704.18x = 971.77 × 393.68
  4. Step 4: Simplify right side
    704.18x = 382,565.86
  5. Step 5: Solve for x
    x = 382,565.86/704.18
  6. Step 6: Final answer
    x = 543.28

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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.