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Finding the Fourth Proportional to 711.12, 981.48 and 396.48

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Solution

The fourth proportional to 711.12, 981.48 and 396.48 is: 547.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.12 : 981.48 = 396.48 : x
  2. Step 2: Convert to fraction form
    711.12/981.48 = 396.48/x
  3. Step 3: Cross multiply
    711.12x = 981.48 × 396.48
  4. Step 4: Simplify right side
    711.12x = 389,137.19
  5. Step 5: Solve for x
    x = 389,137.19/711.12
  6. Step 6: Final answer
    x = 547.22

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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.