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Finding the Third Proportional to 858 and 1,988

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Solution

The third proportional to 858 and 1,988 is: 4,606.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    858 : 1,988 = 1,988 : x
  2. Step 2: Convert to fraction form
    858/1,988 = 1,988/x
  3. Step 3: Cross multiply
    858x = 1,988 × 1,988
  4. Step 4: Simplify right side
    858x = 3,952,144
  5. Step 5: Solve for x
    x = 3,952,144/858
  6. Step 6: Final answer
    x = 4,606.23

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Why These Related Problems?

These problems maintain the same ratio (2.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.