Home / 243.50-312

Finding the Third Proportional to 243.50 and 312

Calculator

Solution

The third proportional to 243.50 and 312 is: 399.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.50 : 312 = 312 : x
  2. Step 2: Convert to fraction form
    243.50/312 = 312/x
  3. Step 3: Cross multiply
    243.50x = 312 × 312
  4. Step 4: Simplify right side
    243.50x = 97,344
  5. Step 5: Solve for x
    x = 97,344/243.50
  6. Step 6: Final answer
    x = 399.77

Related Problems

Find third proportional to 121.75 and 156
Half scale
Find third proportional to 487 and 624
Double scale
Find third proportional to 246 and 315
Similar ratio
Find third proportional to 365.25 and 468
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.