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Finding the Third Proportional to 319.78 and 472.78

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Solution

The third proportional to 319.78 and 472.78 is: 698.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.78 : 472.78 = 472.78 : x
  2. Step 2: Convert to fraction form
    319.78/472.78 = 472.78/x
  3. Step 3: Cross multiply
    319.78x = 472.78 × 472.78
  4. Step 4: Simplify right side
    319.78x = 223,522.11
  5. Step 5: Solve for x
    x = 223,522.11/319.78
  6. Step 6: Final answer
    x = 698.98

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.