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Finding the Third Proportional to 423.75 and 644.63

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Solution

The third proportional to 423.75 and 644.63 is: 980.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.75 : 644.63 = 644.63 : x
  2. Step 2: Convert to fraction form
    423.75/644.63 = 644.63/x
  3. Step 3: Cross multiply
    423.75x = 644.63 × 644.63
  4. Step 4: Simplify right side
    423.75x = 415,541.39
  5. Step 5: Solve for x
    x = 415,541.39/423.75
  6. Step 6: Final answer
    x = 980.63

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.