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Finding the Third Proportional to 157.78 and 421.03

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Solution

The third proportional to 157.78 and 421.03 is: 1,123.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.78 : 421.03 = 421.03 : x
  2. Step 2: Convert to fraction form
    157.78/421.03 = 421.03/x
  3. Step 3: Cross multiply
    157.78x = 421.03 × 421.03
  4. Step 4: Simplify right side
    157.78x = 177,267.31
  5. Step 5: Solve for x
    x = 177,267.31/157.78
  6. Step 6: Final answer
    x = 1,123.50

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Why These Related Problems?

These problems maintain the same ratio (2.67) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.