Home / 68,518.72-102,782.56-21,128

Finding the Fourth Proportional to 68,518.72, 102,782.56 and 21,128

Calculator

Solution

The fourth proportional to 68,518.72, 102,782.56 and 21,128 is: 31,693.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,518.72 : 102,782.56 = 21,128 : x
  2. Step 2: Convert to fraction form
    68,518.72/102,782.56 = 21,128/x
  3. Step 3: Cross multiply
    68,518.72x = 102,782.56 × 21,128
  4. Step 4: Simplify right side
    68,518.72x = 2,171,589,927.68
  5. Step 5: Solve for x
    x = 2,171,589,927.68/68,518.72
  6. Step 6: Final answer
    x = 31,693.38

Related Problems

Find fourth proportional to 34,259.36, 51,391.28 and 10,564
Half scale
Find fourth proportional to 137,037.44, 205,565.12 and 42,256
Double scale
Find fourth proportional to 68,519.72, 102,784.06 and 21,129
Similar ratio
Find fourth proportional to 102,778.08, 154,173.84 and 31,692
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.