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Finding the Third Proportional to 390 and 1,038

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Solution

The third proportional to 390 and 1,038 is: 2,762.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    390 : 1,038 = 1,038 : x
  2. Step 2: Convert to fraction form
    390/1,038 = 1,038/x
  3. Step 3: Cross multiply
    390x = 1,038 × 1,038
  4. Step 4: Simplify right side
    390x = 1,077,444
  5. Step 5: Solve for x
    x = 1,077,444/390
  6. Step 6: Final answer
    x = 2,762.68

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Why These Related Problems?

These problems maintain the same ratio (2.66) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.