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Finding the Third Proportional to 639.84 and 900.84

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Solution

The third proportional to 639.84 and 900.84 is: 1,268.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.84 : 900.84 = 900.84 : x
  2. Step 2: Convert to fraction form
    639.84/900.84 = 900.84/x
  3. Step 3: Cross multiply
    639.84x = 900.84 × 900.84
  4. Step 4: Simplify right side
    639.84x = 811,519.46
  5. Step 5: Solve for x
    x = 811,519.46/639.84
  6. Step 6: Final answer
    x = 1,268.31

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.