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Finding the Third Proportional to 858.50 and 1,880

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Solution

The third proportional to 858.50 and 1,880 is: 4,116.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.50 : 1,880 = 1,880 : x
  2. Step 2: Convert to fraction form
    858.50/1,880 = 1,880/x
  3. Step 3: Cross multiply
    858.50x = 1,880 × 1,880
  4. Step 4: Simplify right side
    858.50x = 3,534,400
  5. Step 5: Solve for x
    x = 3,534,400/858.50
  6. Step 6: Final answer
    x = 4,116.95

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.