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Finding the Fourth Proportional to 711.11, 981.38 and 396.39

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Solution

The fourth proportional to 711.11, 981.38 and 396.39 is: 547.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.11 : 981.38 = 396.39 : x
  2. Step 2: Convert to fraction form
    711.11/981.38 = 396.39/x
  3. Step 3: Cross multiply
    711.11x = 981.38 × 396.39
  4. Step 4: Simplify right side
    711.11x = 389,007.24
  5. Step 5: Solve for x
    x = 389,007.24/711.11
  6. Step 6: Final answer
    x = 547.05

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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.