Home / 351-492

Finding the Third Proportional to 351 and 492

Calculator

Solution

The third proportional to 351 and 492 is: 689.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    351 : 492 = 492 : x
  2. Step 2: Convert to fraction form
    351/492 = 492/x
  3. Step 3: Cross multiply
    351x = 492 × 492
  4. Step 4: Simplify right side
    351x = 242,064
  5. Step 5: Solve for x
    x = 242,064/351
  6. Step 6: Final answer
    x = 689.64

Related Problems

Find third proportional to 175.50 and 246
Half scale
Find third proportional to 702 and 984
Double scale
Find third proportional to 353 and 495
Similar ratio
Find third proportional to 526.50 and 738
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.