Home / 21,022-31,538-7,171

Finding the Fourth Proportional to 21,022, 31,538 and 7,171

Calculator

Solution

The fourth proportional to 21,022, 31,538 and 7,171 is: 10,758.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,022 : 31,538 = 7,171 : x
  2. Step 2: Convert to fraction form
    21,022/31,538 = 7,171/x
  3. Step 3: Cross multiply
    21,022x = 31,538 × 7,171
  4. Step 4: Simplify right side
    21,022x = 226,158,998
  5. Step 5: Solve for x
    x = 226,158,998/21,022
  6. Step 6: Final answer
    x = 10,758.21

Related Problems

Find fourth proportional to 10,511, 15,769 and 3,585.50
Half scale
Find fourth proportional to 42,044, 63,076 and 14,342
Double scale
Find fourth proportional to 21,023, 31,539.50 and 7,172
Similar ratio
Find fourth proportional to 31,533, 47,307 and 10,756.50
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.