Home / 1,331-1,996.80-561.50

Finding the Fourth Proportional to 1,331, 1,996.80 and 561.50

Calculator

Solution

The fourth proportional to 1,331, 1,996.80 and 561.50 is: 842.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331 : 1,996.80 = 561.50 : x
  2. Step 2: Convert to fraction form
    1,331/1,996.80 = 561.50/x
  3. Step 3: Cross multiply
    1,331x = 1,996.80 × 561.50
  4. Step 4: Simplify right side
    1,331x = 1,121,203.20
  5. Step 5: Solve for x
    x = 1,121,203.20/1,331
  6. Step 6: Final answer
    x = 842.38

Related Problems

Find fourth proportional to 665.50, 998.40 and 280.75
Half scale
Find fourth proportional to 2,662, 3,993.60 and 1,123
Double scale
Find fourth proportional to 1,332, 1,998.30 and 562.50
Similar ratio
Find fourth proportional to 1,996.50, 2,995.20 and 842.25
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.