Home / 239.75-258.50

Finding the Third Proportional to 239.75 and 258.50

Calculator

Solution

The third proportional to 239.75 and 258.50 is: 278.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    239.75 : 258.50 = 258.50 : x
  2. Step 2: Convert to fraction form
    239.75/258.50 = 258.50/x
  3. Step 3: Cross multiply
    239.75x = 258.50 × 258.50
  4. Step 4: Simplify right side
    239.75x = 66,822.25
  5. Step 5: Solve for x
    x = 66,822.25/239.75
  6. Step 6: Final answer
    x = 278.72

Related Problems

Find third proportional to 119.88 and 129.25
Half scale
Find third proportional to 479.50 and 517
Double scale
Find third proportional to 242 and 261
Similar ratio
Find third proportional to 359.63 and 387.75
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.