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Finding the Third Proportional to 855.50 and 1,865

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Solution

The third proportional to 855.50 and 1,865 is: 4,065.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.50 : 1,865 = 1,865 : x
  2. Step 2: Convert to fraction form
    855.50/1,865 = 1,865/x
  3. Step 3: Cross multiply
    855.50x = 1,865 × 1,865
  4. Step 4: Simplify right side
    855.50x = 3,478,225
  5. Step 5: Solve for x
    x = 3,478,225/855.50
  6. Step 6: Final answer
    x = 4,065.72

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.