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Finding the Fourth Proportional to 711.89, 982.43 and 397.19

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Solution

The fourth proportional to 711.89, 982.43 and 397.19 is: 548.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.89 : 982.43 = 397.19 : x
  2. Step 2: Convert to fraction form
    711.89/982.43 = 397.19/x
  3. Step 3: Cross multiply
    711.89x = 982.43 × 397.19
  4. Step 4: Simplify right side
    711.89x = 390,204.47
  5. Step 5: Solve for x
    x = 390,204.47/711.89
  6. Step 6: Final answer
    x = 548.12

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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.