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Finding the Third Proportional to 405.84 and 632.39

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Solution

The third proportional to 405.84 and 632.39 is: 985.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    405.84 : 632.39 = 632.39 : x
  2. Step 2: Convert to fraction form
    405.84/632.39 = 632.39/x
  3. Step 3: Cross multiply
    405.84x = 632.39 × 632.39
  4. Step 4: Simplify right side
    405.84x = 399,917.90
  5. Step 5: Solve for x
    x = 399,917.90/405.84
  6. Step 6: Final answer
    x = 985.40

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.