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Finding the Fourth Proportional to 711.26, 981.62 and 400.82

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Solution

The fourth proportional to 711.26, 981.62 and 400.82 is: 553.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.26 : 981.62 = 400.82 : x
  2. Step 2: Convert to fraction form
    711.26/981.62 = 400.82/x
  3. Step 3: Cross multiply
    711.26x = 981.62 × 400.82
  4. Step 4: Simplify right side
    711.26x = 393,452.93
  5. Step 5: Solve for x
    x = 393,452.93/711.26
  6. Step 6: Final answer
    x = 553.18

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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.