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Finding the Third Proportional to 478.50 and 685.75

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Solution

The third proportional to 478.50 and 685.75 is: 982.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.50 : 685.75 = 685.75 : x
  2. Step 2: Convert to fraction form
    478.50/685.75 = 685.75/x
  3. Step 3: Cross multiply
    478.50x = 685.75 × 685.75
  4. Step 4: Simplify right side
    478.50x = 470,253.06
  5. Step 5: Solve for x
    x = 470,253.06/478.50
  6. Step 6: Final answer
    x = 982.77

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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.