Home / 1,686.72-2,528.64-660

Finding the Fourth Proportional to 1,686.72, 2,528.64 and 660

Calculator

Solution

The fourth proportional to 1,686.72, 2,528.64 and 660 is: 989.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,686.72 : 2,528.64 = 660 : x
  2. Step 2: Convert to fraction form
    1,686.72/2,528.64 = 660/x
  3. Step 3: Cross multiply
    1,686.72x = 2,528.64 × 660
  4. Step 4: Simplify right side
    1,686.72x = 1,668,902.40
  5. Step 5: Solve for x
    x = 1,668,902.40/1,686.72
  6. Step 6: Final answer
    x = 989.44

Related Problems

Find fourth proportional to 843.36, 1,264.32 and 330
Half scale
Find fourth proportional to 3,373.44, 5,057.28 and 1,320
Double scale
Find fourth proportional to 1,687.72, 2,530.14 and 661
Similar ratio
Find fourth proportional to 2,530.08, 3,792.96 and 990
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.