Home / 20,405.72-30,618-9,315.81

Finding the Fourth Proportional to 20,405.72, 30,618 and 9,315.81

Calculator

Solution

The fourth proportional to 20,405.72, 30,618 and 9,315.81 is: 13,978.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,405.72 : 30,618 = 9,315.81 : x
  2. Step 2: Convert to fraction form
    20,405.72/30,618 = 9,315.81/x
  3. Step 3: Cross multiply
    20,405.72x = 30,618 × 9,315.81
  4. Step 4: Simplify right side
    20,405.72x = 285,231,470.58
  5. Step 5: Solve for x
    x = 285,231,470.58/20,405.72
  6. Step 6: Final answer
    x = 13,978.01

Related Problems

Find fourth proportional to 10,202.86, 15,309 and 4,657.91
Half scale
Find fourth proportional to 40,811.45, 61,236 and 18,631.62
Double scale
Find fourth proportional to 20,406.72, 30,619.50 and 9,316.81
Similar ratio
Find fourth proportional to 30,608.58, 45,927 and 13,973.72
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.