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Finding the Third Proportional to 478.50 and 742.75

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Solution

The third proportional to 478.50 and 742.75 is: 1,152.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.50 : 742.75 = 742.75 : x
  2. Step 2: Convert to fraction form
    478.50/742.75 = 742.75/x
  3. Step 3: Cross multiply
    478.50x = 742.75 × 742.75
  4. Step 4: Simplify right side
    478.50x = 551,677.56
  5. Step 5: Solve for x
    x = 551,677.56/478.50
  6. Step 6: Final answer
    x = 1,152.93

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.