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Finding the Fourth Proportional to 981.36, 1,352.21 and 811.41

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Solution

The fourth proportional to 981.36, 1,352.21 and 811.41 is: 1,118.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.36 : 1,352.21 = 811.41 : x
  2. Step 2: Convert to fraction form
    981.36/1,352.21 = 811.41/x
  3. Step 3: Cross multiply
    981.36x = 1,352.21 × 811.41
  4. Step 4: Simplify right side
    981.36x = 1,097,192.66
  5. Step 5: Solve for x
    x = 1,097,192.66/981.36
  6. Step 6: Final answer
    x = 1,118.03

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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.