Home / 76,920-115,380-21,516

Finding the Fourth Proportional to 76,920, 115,380 and 21,516

Calculator

Solution

The fourth proportional to 76,920, 115,380 and 21,516 is: 32,274

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,920 : 115,380 = 21,516 : x
  2. Step 2: Convert to fraction form
    76,920/115,380 = 21,516/x
  3. Step 3: Cross multiply
    76,920x = 115,380 × 21,516
  4. Step 4: Simplify right side
    76,920x = 2,482,516,080
  5. Step 5: Solve for x
    x = 2,482,516,080/76,920
  6. Step 6: Final answer
    x = 32,274

Related Problems

Find fourth proportional to 38,460, 57,690 and 10,758
Half scale
Find fourth proportional to 153,840, 230,760 and 43,032
Double scale
Find fourth proportional to 76,921, 115,381.50 and 21,517
Similar ratio
Find fourth proportional to 115,380, 173,070 and 32,274
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.