Home / 278.50-321

Finding the Third Proportional to 278.50 and 321

Calculator

Solution

The third proportional to 278.50 and 321 is: 369.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.50 : 321 = 321 : x
  2. Step 2: Convert to fraction form
    278.50/321 = 321/x
  3. Step 3: Cross multiply
    278.50x = 321 × 321
  4. Step 4: Simplify right side
    278.50x = 103,041
  5. Step 5: Solve for x
    x = 103,041/278.50
  6. Step 6: Final answer
    x = 369.99

Related Problems

Find third proportional to 139.25 and 160.50
Half scale
Find third proportional to 557 and 642
Double scale
Find third proportional to 281 and 323
Similar ratio
Find third proportional to 417.75 and 481.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.