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Finding the Third Proportional to 688 and 1,858

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Solution

The third proportional to 688 and 1,858 is: 5,017.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    688 : 1,858 = 1,858 : x
  2. Step 2: Convert to fraction form
    688/1,858 = 1,858/x
  3. Step 3: Cross multiply
    688x = 1,858 × 1,858
  4. Step 4: Simplify right side
    688x = 3,452,164
  5. Step 5: Solve for x
    x = 3,452,164/688
  6. Step 6: Final answer
    x = 5,017.68

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Why These Related Problems?

These problems maintain the same ratio (2.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.