Home / 1,618.71-2,232.81-1,221

Finding the Fourth Proportional to 1,618.71, 2,232.81 and 1,221

Calculator

Solution

The fourth proportional to 1,618.71, 2,232.81 and 1,221 is: 1,684.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,618.71 : 2,232.81 = 1,221 : x
  2. Step 2: Convert to fraction form
    1,618.71/2,232.81 = 1,221/x
  3. Step 3: Cross multiply
    1,618.71x = 2,232.81 × 1,221
  4. Step 4: Simplify right side
    1,618.71x = 2,726,261.01
  5. Step 5: Solve for x
    x = 2,726,261.01/1,618.71
  6. Step 6: Final answer
    x = 1,684.22

Related Problems

Find fourth proportional to 809.36, 1,116.41 and 610.50
Half scale
Find fourth proportional to 3,237.42, 4,465.62 and 2,442
Double scale
Find fourth proportional to 1,619.71, 2,234.19 and 1,222
Similar ratio
Find fourth proportional to 2,428.07, 3,349.22 and 1,831.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.