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Finding the Third Proportional to 407 and 631.25

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Solution

The third proportional to 407 and 631.25 is: 979.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    407 : 631.25 = 631.25 : x
  2. Step 2: Convert to fraction form
    407/631.25 = 631.25/x
  3. Step 3: Cross multiply
    407x = 631.25 × 631.25
  4. Step 4: Simplify right side
    407x = 398,476.56
  5. Step 5: Solve for x
    x = 398,476.56/407
  6. Step 6: Final answer
    x = 979.06

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.