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Finding the Fourth Proportional to 711.03, 981.18 and 396.33

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Solution

The fourth proportional to 711.03, 981.18 and 396.33 is: 546.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.03 : 981.18 = 396.33 : x
  2. Step 2: Convert to fraction form
    711.03/981.18 = 396.33/x
  3. Step 3: Cross multiply
    711.03x = 981.18 × 396.33
  4. Step 4: Simplify right side
    711.03x = 388,869.06
  5. Step 5: Solve for x
    x = 388,869.06/711.03
  6. Step 6: Final answer
    x = 546.91

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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.