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Finding the Third Proportional to 921.75 and 1,386.38

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Solution

The third proportional to 921.75 and 1,386.38 is: 2,085.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.75 : 1,386.38 = 1,386.38 : x
  2. Step 2: Convert to fraction form
    921.75/1,386.38 = 1,386.38/x
  3. Step 3: Cross multiply
    921.75x = 1,386.38 × 1,386.38
  4. Step 4: Simplify right side
    921.75x = 1,922,035.64
  5. Step 5: Solve for x
    x = 1,922,035.64/921.75
  6. Step 6: Final answer
    x = 2,085.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.