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Finding the Third Proportional to 7,321 and 15,786

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Solution

The third proportional to 7,321 and 15,786 is: 34,038.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,321 : 15,786 = 15,786 : x
  2. Step 2: Convert to fraction form
    7,321/15,786 = 15,786/x
  3. Step 3: Cross multiply
    7,321x = 15,786 × 15,786
  4. Step 4: Simplify right side
    7,321x = 249,197,796
  5. Step 5: Solve for x
    x = 249,197,796/7,321
  6. Step 6: Final answer
    x = 34,038.76

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.