Home / 1,791-2,686.50-636.75

Finding the Fourth Proportional to 1,791, 2,686.50 and 636.75

Calculator

Solution

The fourth proportional to 1,791, 2,686.50 and 636.75 is: 955.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,791 : 2,686.50 = 636.75 : x
  2. Step 2: Convert to fraction form
    1,791/2,686.50 = 636.75/x
  3. Step 3: Cross multiply
    1,791x = 2,686.50 × 636.75
  4. Step 4: Simplify right side
    1,791x = 1,710,628.88
  5. Step 5: Solve for x
    x = 1,710,628.88/1,791
  6. Step 6: Final answer
    x = 955.13

Related Problems

Find fourth proportional to 895.50, 1,343.25 and 318.38
Half scale
Find fourth proportional to 3,582, 5,373 and 1,273.50
Double scale
Find fourth proportional to 1,792, 2,688 and 637.75
Similar ratio
Find fourth proportional to 2,686.50, 4,029.75 and 955.13
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.