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Finding the Third Proportional to 639 and 977.25

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Solution

The third proportional to 639 and 977.25 is: 1,494.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    639 : 977.25 = 977.25 : x
  2. Step 2: Convert to fraction form
    639/977.25 = 977.25/x
  3. Step 3: Cross multiply
    639x = 977.25 × 977.25
  4. Step 4: Simplify right side
    639x = 955,017.56
  5. Step 5: Solve for x
    x = 955,017.56/639
  6. Step 6: Final answer
    x = 1,494.55

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.