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Finding the Third Proportional to 642.50 and 859

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Solution

The third proportional to 642.50 and 859 is: 1,148.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.50 : 859 = 859 : x
  2. Step 2: Convert to fraction form
    642.50/859 = 859/x
  3. Step 3: Cross multiply
    642.50x = 859 × 859
  4. Step 4: Simplify right side
    642.50x = 737,881
  5. Step 5: Solve for x
    x = 737,881/642.50
  6. Step 6: Final answer
    x = 1,148.45

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.