Home / 81,211.74-121,854-51,621.90

Finding the Fourth Proportional to 81,211.74, 121,854 and 51,621.90

Calculator

Solution

The fourth proportional to 81,211.74, 121,854 and 51,621.90 is: 77,455.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,211.74 : 121,854 = 51,621.90 : x
  2. Step 2: Convert to fraction form
    81,211.74/121,854 = 51,621.90/x
  3. Step 3: Cross multiply
    81,211.74x = 121,854 × 51,621.90
  4. Step 4: Simplify right side
    81,211.74x = 6,290,335,002.60
  5. Step 5: Solve for x
    x = 6,290,335,002.60/81,211.74
  6. Step 6: Final answer
    x = 77,455.98

Related Problems

Find fourth proportional to 40,605.87, 60,927 and 25,810.95
Half scale
Find fourth proportional to 162,423.48, 243,708 and 103,243.80
Double scale
Find fourth proportional to 81,212.74, 121,855.50 and 51,622.90
Similar ratio
Find fourth proportional to 121,817.61, 182,781 and 77,432.85
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.