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Finding the Third Proportional to 7,980 and 19,320

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Solution

The third proportional to 7,980 and 19,320 is: 46,774.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,980 : 19,320 = 19,320 : x
  2. Step 2: Convert to fraction form
    7,980/19,320 = 19,320/x
  3. Step 3: Cross multiply
    7,980x = 19,320 × 19,320
  4. Step 4: Simplify right side
    7,980x = 373,262,400
  5. Step 5: Solve for x
    x = 373,262,400/7,980
  6. Step 6: Final answer
    x = 46,774.74

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Why These Related Problems?

These problems maintain the same ratio (2.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.