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Finding the Third Proportional to 481.78 and 689.06

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Solution

The third proportional to 481.78 and 689.06 is: 985.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.78 : 689.06 = 689.06 : x
  2. Step 2: Convert to fraction form
    481.78/689.06 = 689.06/x
  3. Step 3: Cross multiply
    481.78x = 689.06 × 689.06
  4. Step 4: Simplify right side
    481.78x = 474,807.13
  5. Step 5: Solve for x
    x = 474,807.13/481.78
  6. Step 6: Final answer
    x = 985.52

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.