Home / 976.22-1,346-643.92

Finding the Fourth Proportional to 976.22, 1,346 and 643.92

Calculator

Solution

The fourth proportional to 976.22, 1,346 and 643.92 is: 887.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.22 : 1,346 = 643.92 : x
  2. Step 2: Convert to fraction form
    976.22/1,346 = 643.92/x
  3. Step 3: Cross multiply
    976.22x = 1,346 × 643.92
  4. Step 4: Simplify right side
    976.22x = 866,716.32
  5. Step 5: Solve for x
    x = 866,716.32/976.22
  6. Step 6: Final answer
    x = 887.83

Related Problems

Find fourth proportional to 488.11, 673 and 321.96
Half scale
Find fourth proportional to 1,952.44, 2,692 and 1,287.84
Double scale
Find fourth proportional to 977.22, 1,347.38 and 644.92
Similar ratio
Find fourth proportional to 1,464.33, 2,019 and 965.88
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.