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Finding the Third Proportional to 611 and 921.50

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Solution

The third proportional to 611 and 921.50 is: 1,389.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    611 : 921.50 = 921.50 : x
  2. Step 2: Convert to fraction form
    611/921.50 = 921.50/x
  3. Step 3: Cross multiply
    611x = 921.50 × 921.50
  4. Step 4: Simplify right side
    611x = 849,162.25
  5. Step 5: Solve for x
    x = 849,162.25/611
  6. Step 6: Final answer
    x = 1,389.79

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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.