Home / 209-288.18-143.39

Finding the Fourth Proportional to 209, 288.18 and 143.39

Calculator

Solution

The fourth proportional to 209, 288.18 and 143.39 is: 197.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    209 : 288.18 = 143.39 : x
  2. Step 2: Convert to fraction form
    209/288.18 = 143.39/x
  3. Step 3: Cross multiply
    209x = 288.18 × 143.39
  4. Step 4: Simplify right side
    209x = 41,322.13
  5. Step 5: Solve for x
    x = 41,322.13/209
  6. Step 6: Final answer
    x = 197.71

Related Problems

Find fourth proportional to 104.50, 144.09 and 71.70
Half scale
Find fourth proportional to 418, 576.36 and 286.78
Double scale
Find fourth proportional to 210, 289.56 and 144.39
Similar ratio
Find fourth proportional to 313.50, 432.27 and 215.09
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.