Home / 722-998.16-691.40

Finding the Fourth Proportional to 722, 998.16 and 691.40

Calculator

Solution

The fourth proportional to 722, 998.16 and 691.40 is: 955.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    722 : 998.16 = 691.40 : x
  2. Step 2: Convert to fraction form
    722/998.16 = 691.40/x
  3. Step 3: Cross multiply
    722x = 998.16 × 691.40
  4. Step 4: Simplify right side
    722x = 690,127.82
  5. Step 5: Solve for x
    x = 690,127.82/722
  6. Step 6: Final answer
    x = 955.86

Related Problems

Find fourth proportional to 361, 499.08 and 345.70
Half scale
Find fourth proportional to 1,444, 1,996.32 and 1,382.80
Double scale
Find fourth proportional to 723, 999.54 and 692.40
Similar ratio
Find fourth proportional to 1,083, 1,497.24 and 1,037.10
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.