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Finding the Third Proportional to 438.75 and 842.63

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Solution

The third proportional to 438.75 and 842.63 is: 1,618.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.75 : 842.63 = 842.63 : x
  2. Step 2: Convert to fraction form
    438.75/842.63 = 842.63/x
  3. Step 3: Cross multiply
    438.75x = 842.63 × 842.63
  4. Step 4: Simplify right side
    438.75x = 710,016.89
  5. Step 5: Solve for x
    x = 710,016.89/438.75
  6. Step 6: Final answer
    x = 1,618.27

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Why These Related Problems?

These problems maintain the same ratio (1.92) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.