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Finding the Third Proportional to 7,890 and 16,428

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Solution

The third proportional to 7,890 and 16,428 is: 34,205.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,890 : 16,428 = 16,428 : x
  2. Step 2: Convert to fraction form
    7,890/16,428 = 16,428/x
  3. Step 3: Cross multiply
    7,890x = 16,428 × 16,428
  4. Step 4: Simplify right side
    7,890x = 269,879,184
  5. Step 5: Solve for x
    x = 269,879,184/7,890
  6. Step 6: Final answer
    x = 34,205.22

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.