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Finding the Fourth Proportional to 711.84, 982.28 and 397.09

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Solution

The fourth proportional to 711.84, 982.28 and 397.09 is: 547.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.84 : 982.28 = 397.09 : x
  2. Step 2: Convert to fraction form
    711.84/982.28 = 397.09/x
  3. Step 3: Cross multiply
    711.84x = 982.28 × 397.09
  4. Step 4: Simplify right side
    711.84x = 390,048.03
  5. Step 5: Solve for x
    x = 390,048.03/711.84
  6. Step 6: Final answer
    x = 547.94

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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.