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Finding the Fourth Proportional to 711.23, 981.51 and 396.53

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Solution

The fourth proportional to 711.23, 981.51 and 396.53 is: 547.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.23 : 981.51 = 396.53 : x
  2. Step 2: Convert to fraction form
    711.23/981.51 = 396.53/x
  3. Step 3: Cross multiply
    711.23x = 981.51 × 396.53
  4. Step 4: Simplify right side
    711.23x = 389,197.68
  5. Step 5: Solve for x
    x = 389,197.68/711.23
  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.