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Finding the Third Proportional to 2,690 and 4,155.50

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Solution

The third proportional to 2,690 and 4,155.50 is: 6,419.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,690 : 4,155.50 = 4,155.50 : x
  2. Step 2: Convert to fraction form
    2,690/4,155.50 = 4,155.50/x
  3. Step 3: Cross multiply
    2,690x = 4,155.50 × 4,155.50
  4. Step 4: Simplify right side
    2,690x = 17,268,180.25
  5. Step 5: Solve for x
    x = 17,268,180.25/2,690
  6. Step 6: Final answer
    x = 6,419.40

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.