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Finding the Third Proportional to 259.31 and 428.25

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Solution

The third proportional to 259.31 and 428.25 is: 707.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.31 : 428.25 = 428.25 : x
  2. Step 2: Convert to fraction form
    259.31/428.25 = 428.25/x
  3. Step 3: Cross multiply
    259.31x = 428.25 × 428.25
  4. Step 4: Simplify right side
    259.31x = 183,398.06
  5. Step 5: Solve for x
    x = 183,398.06/259.31
  6. Step 6: Final answer
    x = 707.25

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Why These Related Problems?

These problems maintain the same ratio (1.65) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.