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Finding the Fourth Proportional to 704.39, 972.09 and 393.89

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Solution

The fourth proportional to 704.39, 972.09 and 393.89 is: 543.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.39 : 972.09 = 393.89 : x
  2. Step 2: Convert to fraction form
    704.39/972.09 = 393.89/x
  3. Step 3: Cross multiply
    704.39x = 972.09 × 393.89
  4. Step 4: Simplify right side
    704.39x = 382,896.53
  5. Step 5: Solve for x
    x = 382,896.53/704.39
  6. Step 6: Final answer
    x = 543.59

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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.