Home / 485.50-556

Finding the Third Proportional to 485.50 and 556

Calculator

Solution

The third proportional to 485.50 and 556 is: 636.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.50 : 556 = 556 : x
  2. Step 2: Convert to fraction form
    485.50/556 = 556/x
  3. Step 3: Cross multiply
    485.50x = 556 × 556
  4. Step 4: Simplify right side
    485.50x = 309,136
  5. Step 5: Solve for x
    x = 309,136/485.50
  6. Step 6: Final answer
    x = 636.74

Related Problems

Find third proportional to 242.75 and 278
Half scale
Find third proportional to 971 and 1,112
Double scale
Find third proportional to 488 and 558
Similar ratio
Find third proportional to 728.25 and 834
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.