Home / 279.75-309.75

Finding the Third Proportional to 279.75 and 309.75

Calculator

Solution

The third proportional to 279.75 and 309.75 is: 342.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.75 : 309.75 = 309.75 : x
  2. Step 2: Convert to fraction form
    279.75/309.75 = 309.75/x
  3. Step 3: Cross multiply
    279.75x = 309.75 × 309.75
  4. Step 4: Simplify right side
    279.75x = 95,945.06
  5. Step 5: Solve for x
    x = 95,945.06/279.75
  6. Step 6: Final answer
    x = 342.97

Related Problems

Find third proportional to 139.88 and 154.88
Half scale
Find third proportional to 559.50 and 619.50
Double scale
Find third proportional to 282 and 312
Similar ratio
Find third proportional to 419.63 and 464.63
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.