Home / 776.80-1,073.52-636.69

Finding the Fourth Proportional to 776.80, 1,073.52 and 636.69

Calculator

Solution

The fourth proportional to 776.80, 1,073.52 and 636.69 is: 879.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.80 : 1,073.52 = 636.69 : x
  2. Step 2: Convert to fraction form
    776.80/1,073.52 = 636.69/x
  3. Step 3: Cross multiply
    776.80x = 1,073.52 × 636.69
  4. Step 4: Simplify right side
    776.80x = 683,499.45
  5. Step 5: Solve for x
    x = 683,499.45/776.80
  6. Step 6: Final answer
    x = 879.89

Related Problems

Find fourth proportional to 388.40, 536.76 and 318.35
Half scale
Find fourth proportional to 1,553.60, 2,147.04 and 1,273.38
Double scale
Find fourth proportional to 777.80, 1,074.90 and 637.69
Similar ratio
Find fourth proportional to 1,165.20, 1,610.28 and 955.04
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.