Home / 86,624-129,936-20,960

Finding the Fourth Proportional to 86,624, 129,936 and 20,960

Calculator

Solution

The fourth proportional to 86,624, 129,936 and 20,960 is: 31,440

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,624 : 129,936 = 20,960 : x
  2. Step 2: Convert to fraction form
    86,624/129,936 = 20,960/x
  3. Step 3: Cross multiply
    86,624x = 129,936 × 20,960
  4. Step 4: Simplify right side
    86,624x = 2,723,458,560
  5. Step 5: Solve for x
    x = 2,723,458,560/86,624
  6. Step 6: Final answer
    x = 31,440

Related Problems

Find fourth proportional to 43,312, 64,968 and 10,480
Half scale
Find fourth proportional to 173,248, 259,872 and 41,920
Double scale
Find fourth proportional to 86,625, 129,937.50 and 20,961
Similar ratio
Find fourth proportional to 129,936, 194,904 and 31,440
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.