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Finding the Third Proportional to 405.84 and 646.73

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Solution

The third proportional to 405.84 and 646.73 is: 1,030.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.84 : 646.73 = 646.73 : x
  2. Step 2: Convert to fraction form
    405.84/646.73 = 646.73/x
  3. Step 3: Cross multiply
    405.84x = 646.73 × 646.73
  4. Step 4: Simplify right side
    405.84x = 418,265.35
  5. Step 5: Solve for x
    x = 418,265.35/405.84
  6. Step 6: Final answer
    x = 1,030.61

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.