Home / 657.10-985.65-613.90

Finding the Fourth Proportional to 657.10, 985.65 and 613.90

Calculator

Solution

The fourth proportional to 657.10, 985.65 and 613.90 is: 920.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.10 : 985.65 = 613.90 : x
  2. Step 2: Convert to fraction form
    657.10/985.65 = 613.90/x
  3. Step 3: Cross multiply
    657.10x = 985.65 × 613.90
  4. Step 4: Simplify right side
    657.10x = 605,090.54
  5. Step 5: Solve for x
    x = 605,090.54/657.10
  6. Step 6: Final answer
    x = 920.85

Related Problems

Find fourth proportional to 328.55, 492.83 and 306.95
Half scale
Find fourth proportional to 1,314.20, 1,971.30 and 1,227.80
Double scale
Find fourth proportional to 658.10, 987.15 and 614.90
Similar ratio
Find fourth proportional to 985.65, 1,478.48 and 920.85
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.