Home / 274-390

Finding the Third Proportional to 274 and 390

Calculator

Solution

The third proportional to 274 and 390 is: 555.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    274 : 390 = 390 : x
  2. Step 2: Convert to fraction form
    274/390 = 390/x
  3. Step 3: Cross multiply
    274x = 390 × 390
  4. Step 4: Simplify right side
    274x = 152,100
  5. Step 5: Solve for x
    x = 152,100/274
  6. Step 6: Final answer
    x = 555.11

Related Problems

Find third proportional to 137 and 195
Half scale
Find third proportional to 548 and 780
Double scale
Find third proportional to 276 and 393
Similar ratio
Find third proportional to 411 and 585
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.