Home / 1,209.34-1,668.92-712

Finding the Fourth Proportional to 1,209.34, 1,668.92 and 712

Calculator

Solution

The fourth proportional to 1,209.34, 1,668.92 and 712 is: 982.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.34 : 1,668.92 = 712 : x
  2. Step 2: Convert to fraction form
    1,209.34/1,668.92 = 712/x
  3. Step 3: Cross multiply
    1,209.34x = 1,668.92 × 712
  4. Step 4: Simplify right side
    1,209.34x = 1,188,271.04
  5. Step 5: Solve for x
    x = 1,188,271.04/1,209.34
  6. Step 6: Final answer
    x = 982.58

Related Problems

Find fourth proportional to 604.67, 834.46 and 356
Half scale
Find fourth proportional to 2,418.68, 3,337.84 and 1,424
Double scale
Find fourth proportional to 1,210.34, 1,670.30 and 713
Similar ratio
Find fourth proportional to 1,814.01, 2,503.38 and 1,068
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.