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Finding the Fourth Proportional to 911.25, 1,373.09 and 811.80

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Solution

The fourth proportional to 911.25, 1,373.09 and 811.80 is: 1,223.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.25 : 1,373.09 = 811.80 : x
  2. Step 2: Convert to fraction form
    911.25/1,373.09 = 811.80/x
  3. Step 3: Cross multiply
    911.25x = 1,373.09 × 811.80
  4. Step 4: Simplify right side
    911.25x = 1,114,663.54
  5. Step 5: Solve for x
    x = 1,114,663.54/911.25
  6. Step 6: Final answer
    x = 1,223.22

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.