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Finding the Third Proportional to 393.47 and 911.95

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Solution

The third proportional to 393.47 and 911.95 is: 2,113.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.47 : 911.95 = 911.95 : x
  2. Step 2: Convert to fraction form
    393.47/911.95 = 911.95/x
  3. Step 3: Cross multiply
    393.47x = 911.95 × 911.95
  4. Step 4: Simplify right side
    393.47x = 831,658.50
  5. Step 5: Solve for x
    x = 831,658.50/393.47
  6. Step 6: Final answer
    x = 2,113.66

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Why These Related Problems?

These problems maintain the same ratio (2.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.