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Finding the Fourth Proportional to 911.51, 1,361.07 and 724.30

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Solution

The fourth proportional to 911.51, 1,361.07 and 724.30 is: 1,081.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.51 : 1,361.07 = 724.30 : x
  2. Step 2: Convert to fraction form
    911.51/1,361.07 = 724.30/x
  3. Step 3: Cross multiply
    911.51x = 1,361.07 × 724.30
  4. Step 4: Simplify right side
    911.51x = 985,823.00
  5. Step 5: Solve for x
    x = 985,823.00/911.51
  6. Step 6: Final answer
    x = 1,081.53

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.