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Finding the Third Proportional to 623 and 1,111

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Solution

The third proportional to 623 and 1,111 is: 1,981.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    623 : 1,111 = 1,111 : x
  2. Step 2: Convert to fraction form
    623/1,111 = 1,111/x
  3. Step 3: Cross multiply
    623x = 1,111 × 1,111
  4. Step 4: Simplify right side
    623x = 1,234,321
  5. Step 5: Solve for x
    x = 1,234,321/623
  6. Step 6: Final answer
    x = 1,981.25

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Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.