Home / 86,458-129,687-20,794

Finding the Fourth Proportional to 86,458, 129,687 and 20,794

Calculator

Solution

The fourth proportional to 86,458, 129,687 and 20,794 is: 31,191

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,458 : 129,687 = 20,794 : x
  2. Step 2: Convert to fraction form
    86,458/129,687 = 20,794/x
  3. Step 3: Cross multiply
    86,458x = 129,687 × 20,794
  4. Step 4: Simplify right side
    86,458x = 2,696,711,478
  5. Step 5: Solve for x
    x = 2,696,711,478/86,458
  6. Step 6: Final answer
    x = 31,191

Related Problems

Find fourth proportional to 43,229, 64,843.50 and 10,397
Half scale
Find fourth proportional to 172,916, 259,374 and 41,588
Double scale
Find fourth proportional to 86,459, 129,688.50 and 20,795
Similar ratio
Find fourth proportional to 129,687, 194,530.50 and 31,191
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.