Home / 1,992.56-2,990.76-1,478

Finding the Fourth Proportional to 1,992.56, 2,990.76 and 1,478

Calculator

Solution

The fourth proportional to 1,992.56, 2,990.76 and 1,478 is: 2,218.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,992.56 : 2,990.76 = 1,478 : x
  2. Step 2: Convert to fraction form
    1,992.56/2,990.76 = 1,478/x
  3. Step 3: Cross multiply
    1,992.56x = 2,990.76 × 1,478
  4. Step 4: Simplify right side
    1,992.56x = 4,420,343.28
  5. Step 5: Solve for x
    x = 4,420,343.28/1,992.56
  6. Step 6: Final answer
    x = 2,218.42

Related Problems

Find fourth proportional to 996.28, 1,495.38 and 739
Half scale
Find fourth proportional to 3,985.12, 5,981.52 and 2,956
Double scale
Find fourth proportional to 1,993.56, 2,992.26 and 1,479
Similar ratio
Find fourth proportional to 2,988.84, 4,486.14 and 2,217
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.