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Finding the Third Proportional to 405 and 551.81

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Solution

The third proportional to 405 and 551.81 is: 751.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    405 : 551.81 = 551.81 : x
  2. Step 2: Convert to fraction form
    405/551.81 = 551.81/x
  3. Step 3: Cross multiply
    405x = 551.81 × 551.81
  4. Step 4: Simplify right side
    405x = 304,497.04
  5. Step 5: Solve for x
    x = 304,497.04/405
  6. Step 6: Final answer
    x = 751.84

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.