Home / 255-560

Finding the Third Proportional to 255 and 560

Calculator

Solution

The third proportional to 255 and 560 is: 1,229.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    255 : 560 = 560 : x
  2. Step 2: Convert to fraction form
    255/560 = 560/x
  3. Step 3: Cross multiply
    255x = 560 × 560
  4. Step 4: Simplify right side
    255x = 313,600
  5. Step 5: Solve for x
    x = 313,600/255
  6. Step 6: Final answer
    x = 1,229.80

Related Problems

Find third proportional to 127.50 and 280
Half scale
Find third proportional to 510 and 1,120
Double scale
Find third proportional to 257 and 564
Similar ratio
Find third proportional to 382.50 and 840
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.