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Finding the Third Proportional to 397.50 and 860.06

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Solution

The third proportional to 397.50 and 860.06 is: 1,860.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.50 : 860.06 = 860.06 : x
  2. Step 2: Convert to fraction form
    397.50/860.06 = 860.06/x
  3. Step 3: Cross multiply
    397.50x = 860.06 × 860.06
  4. Step 4: Simplify right side
    397.50x = 739,707.50
  5. Step 5: Solve for x
    x = 739,707.50/397.50
  6. Step 6: Final answer
    x = 1,860.90

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.