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Finding the Third Proportional to 280.55 and 416.81

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Solution

The third proportional to 280.55 and 416.81 is: 619.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.55 : 416.81 = 416.81 : x
  2. Step 2: Convert to fraction form
    280.55/416.81 = 416.81/x
  3. Step 3: Cross multiply
    280.55x = 416.81 × 416.81
  4. Step 4: Simplify right side
    280.55x = 173,732.66
  5. Step 5: Solve for x
    x = 173,732.66/280.55
  6. Step 6: Final answer
    x = 619.26

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.