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Finding the Third Proportional to 639 and 859.50

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Solution

The third proportional to 639 and 859.50 is: 1,156.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    639 : 859.50 = 859.50 : x
  2. Step 2: Convert to fraction form
    639/859.50 = 859.50/x
  3. Step 3: Cross multiply
    639x = 859.50 × 859.50
  4. Step 4: Simplify right side
    639x = 738,740.25
  5. Step 5: Solve for x
    x = 738,740.25/639
  6. Step 6: Final answer
    x = 1,156.09

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.