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Finding the Fourth Proportional to 711.50, 981.86 and 396.74

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Solution

The fourth proportional to 711.50, 981.86 and 396.74 is: 547.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.50 : 981.86 = 396.74 : x
  2. Step 2: Convert to fraction form
    711.50/981.86 = 396.74/x
  3. Step 3: Cross multiply
    711.50x = 981.86 × 396.74
  4. Step 4: Simplify right side
    711.50x = 389,536.24
  5. Step 5: Solve for x
    x = 389,536.24/711.50
  6. Step 6: Final answer
    x = 547.49

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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.