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Finding the Fourth Proportional to 711.72, 982.08 and 396.84

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Solution

The fourth proportional to 711.72, 982.08 and 396.84 is: 547.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.72 : 982.08 = 396.84 : x
  2. Step 2: Convert to fraction form
    711.72/982.08 = 396.84/x
  3. Step 3: Cross multiply
    711.72x = 982.08 × 396.84
  4. Step 4: Simplify right side
    711.72x = 389,728.63
  5. Step 5: Solve for x
    x = 389,728.63/711.72
  6. Step 6: Final answer
    x = 547.59

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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.