Home / 990-1,366.56-576

Finding the Fourth Proportional to 990, 1,366.56 and 576

Calculator

Solution

The fourth proportional to 990, 1,366.56 and 576 is: 795.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    990 : 1,366.56 = 576 : x
  2. Step 2: Convert to fraction form
    990/1,366.56 = 576/x
  3. Step 3: Cross multiply
    990x = 1,366.56 × 576
  4. Step 4: Simplify right side
    990x = 787,138.56
  5. Step 5: Solve for x
    x = 787,138.56/990
  6. Step 6: Final answer
    x = 795.09

Related Problems

Find fourth proportional to 495, 683.28 and 288
Half scale
Find fourth proportional to 1,980, 2,733.12 and 1,152
Double scale
Find fourth proportional to 991, 1,367.94 and 577
Similar ratio
Find fourth proportional to 1,485, 2,049.84 and 864
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.