Home / 76,560-114,840-21,156

Finding the Fourth Proportional to 76,560, 114,840 and 21,156

Calculator

Solution

The fourth proportional to 76,560, 114,840 and 21,156 is: 31,734

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,560 : 114,840 = 21,156 : x
  2. Step 2: Convert to fraction form
    76,560/114,840 = 21,156/x
  3. Step 3: Cross multiply
    76,560x = 114,840 × 21,156
  4. Step 4: Simplify right side
    76,560x = 2,429,555,040
  5. Step 5: Solve for x
    x = 2,429,555,040/76,560
  6. Step 6: Final answer
    x = 31,734

Related Problems

Find fourth proportional to 38,280, 57,420 and 10,578
Half scale
Find fourth proportional to 153,120, 229,680 and 42,312
Double scale
Find fourth proportional to 76,561, 114,841.50 and 21,157
Similar ratio
Find fourth proportional to 114,840, 172,260 and 31,734
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.