Home / 878.04-1,209.54-831

Finding the Fourth Proportional to 878.04, 1,209.54 and 831

Calculator

Solution

The fourth proportional to 878.04, 1,209.54 and 831 is: 1,144.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.04 : 1,209.54 = 831 : x
  2. Step 2: Convert to fraction form
    878.04/1,209.54 = 831/x
  3. Step 3: Cross multiply
    878.04x = 1,209.54 × 831
  4. Step 4: Simplify right side
    878.04x = 1,005,127.74
  5. Step 5: Solve for x
    x = 1,005,127.74/878.04
  6. Step 6: Final answer
    x = 1,144.74

Related Problems

Find fourth proportional to 439.02, 604.77 and 415.50
Half scale
Find fourth proportional to 1,756.08, 2,419.08 and 1,662
Double scale
Find fourth proportional to 879.04, 1,210.92 and 832
Similar ratio
Find fourth proportional to 1,317.06, 1,814.31 and 1,246.50
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.