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Finding the Third Proportional to 2,155 and 2,565.50

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Solution

The third proportional to 2,155 and 2,565.50 is: 3,054.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,155 : 2,565.50 = 2,565.50 : x
  2. Step 2: Convert to fraction form
    2,155/2,565.50 = 2,565.50/x
  3. Step 3: Cross multiply
    2,155x = 2,565.50 × 2,565.50
  4. Step 4: Simplify right side
    2,155x = 6,581,790.25
  5. Step 5: Solve for x
    x = 6,581,790.25/2,155
  6. Step 6: Final answer
    x = 3,054.20

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Why These Related Problems?

These problems maintain the same ratio (1.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.