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Finding the Fourth Proportional to 711.06, 981.20 and 396.30

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Solution

The fourth proportional to 711.06, 981.20 and 396.30 is: 546.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.06 : 981.20 = 396.30 : x
  2. Step 2: Convert to fraction form
    711.06/981.20 = 396.30/x
  3. Step 3: Cross multiply
    711.06x = 981.20 × 396.30
  4. Step 4: Simplify right side
    711.06x = 388,849.56
  5. Step 5: Solve for x
    x = 388,849.56/711.06
  6. Step 6: Final answer
    x = 546.86

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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.