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Finding the Third Proportional to 688 and 1,055

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Solution

The third proportional to 688 and 1,055 is: 1,617.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    688 : 1,055 = 1,055 : x
  2. Step 2: Convert to fraction form
    688/1,055 = 1,055/x
  3. Step 3: Cross multiply
    688x = 1,055 × 1,055
  4. Step 4: Simplify right side
    688x = 1,113,025
  5. Step 5: Solve for x
    x = 1,113,025/688
  6. Step 6: Final answer
    x = 1,617.77

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.