Home / 513-660

Finding the Third Proportional to 513 and 660

Calculator

Solution

The third proportional to 513 and 660 is: 849.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    513 : 660 = 660 : x
  2. Step 2: Convert to fraction form
    513/660 = 660/x
  3. Step 3: Cross multiply
    513x = 660 × 660
  4. Step 4: Simplify right side
    513x = 435,600
  5. Step 5: Solve for x
    x = 435,600/513
  6. Step 6: Final answer
    x = 849.12

Related Problems

Find third proportional to 256.50 and 330
Half scale
Find third proportional to 1,026 and 1,320
Double scale
Find third proportional to 515 and 663
Similar ratio
Find third proportional to 769.50 and 990
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.29) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.