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Finding the Third Proportional to 813.50 and 1,100

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Solution

The third proportional to 813.50 and 1,100 is: 1,487.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.50 : 1,100 = 1,100 : x
  2. Step 2: Convert to fraction form
    813.50/1,100 = 1,100/x
  3. Step 3: Cross multiply
    813.50x = 1,100 × 1,100
  4. Step 4: Simplify right side
    813.50x = 1,210,000
  5. Step 5: Solve for x
    x = 1,210,000/813.50
  6. Step 6: Final answer
    x = 1,487.40

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.