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Finding the Third Proportional to 438.75 and 964.78

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Solution

The third proportional to 438.75 and 964.78 is: 2,121.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.75 : 964.78 = 964.78 : x
  2. Step 2: Convert to fraction form
    438.75/964.78 = 964.78/x
  3. Step 3: Cross multiply
    438.75x = 964.78 × 964.78
  4. Step 4: Simplify right side
    438.75x = 930,802.86
  5. Step 5: Solve for x
    x = 930,802.86/438.75
  6. Step 6: Final answer
    x = 2,121.49

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.