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Finding the Third Proportional to 25,380 and 39,690

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Solution

The third proportional to 25,380 and 39,690 is: 62,068.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,380 : 39,690 = 39,690 : x
  2. Step 2: Convert to fraction form
    25,380/39,690 = 39,690/x
  3. Step 3: Cross multiply
    25,380x = 39,690 × 39,690
  4. Step 4: Simplify right side
    25,380x = 1,575,296,100
  5. Step 5: Solve for x
    x = 1,575,296,100/25,380
  6. Step 6: Final answer
    x = 62,068.40

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.