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Finding the Third Proportional to 280.50 and 421.13

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Solution

The third proportional to 280.50 and 421.13 is: 632.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.50 : 421.13 = 421.13 : x
  2. Step 2: Convert to fraction form
    280.50/421.13 = 421.13/x
  3. Step 3: Cross multiply
    280.50x = 421.13 × 421.13
  4. Step 4: Simplify right side
    280.50x = 177,346.27
  5. Step 5: Solve for x
    x = 177,346.27/280.50
  6. Step 6: Final answer
    x = 632.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.