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Finding the Third Proportional to 289.25 and 431.50

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Solution

The third proportional to 289.25 and 431.50 is: 643.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.25 : 431.50 = 431.50 : x
  2. Step 2: Convert to fraction form
    289.25/431.50 = 431.50/x
  3. Step 3: Cross multiply
    289.25x = 431.50 × 431.50
  4. Step 4: Simplify right side
    289.25x = 186,192.25
  5. Step 5: Solve for x
    x = 186,192.25/289.25
  6. Step 6: Final answer
    x = 643.71

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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.