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Finding the Third Proportional to 4,155 and 8,490

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Solution

The third proportional to 4,155 and 8,490 is: 17,347.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,155 : 8,490 = 8,490 : x
  2. Step 2: Convert to fraction form
    4,155/8,490 = 8,490/x
  3. Step 3: Cross multiply
    4,155x = 8,490 × 8,490
  4. Step 4: Simplify right side
    4,155x = 72,080,100
  5. Step 5: Solve for x
    x = 72,080,100/4,155
  6. Step 6: Final answer
    x = 17,347.80

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Why These Related Problems?

These problems maintain the same ratio (2.04) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.