Home / 245.80-368.78-143.20

Finding the Fourth Proportional to 245.80, 368.78 and 143.20

Calculator

Solution

The fourth proportional to 245.80, 368.78 and 143.20 is: 214.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.80 : 368.78 = 143.20 : x
  2. Step 2: Convert to fraction form
    245.80/368.78 = 143.20/x
  3. Step 3: Cross multiply
    245.80x = 368.78 × 143.20
  4. Step 4: Simplify right side
    245.80x = 52,809.30
  5. Step 5: Solve for x
    x = 52,809.30/245.80
  6. Step 6: Final answer
    x = 214.85

Related Problems

Find fourth proportional to 122.90, 184.39 and 71.60
Half scale
Find fourth proportional to 491.60, 737.56 and 286.40
Double scale
Find fourth proportional to 246.80, 370.28 and 144.20
Similar ratio
Find fourth proportional to 368.70, 553.17 and 214.80
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.