Home / 245.69-338.94-217.71

Finding the Fourth Proportional to 245.69, 338.94 and 217.71

Calculator

Solution

The fourth proportional to 245.69, 338.94 and 217.71 is: 300.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.69 : 338.94 = 217.71 : x
  2. Step 2: Convert to fraction form
    245.69/338.94 = 217.71/x
  3. Step 3: Cross multiply
    245.69x = 338.94 × 217.71
  4. Step 4: Simplify right side
    245.69x = 73,792.02
  5. Step 5: Solve for x
    x = 73,792.02/245.69
  6. Step 6: Final answer
    x = 300.34

Related Problems

Find fourth proportional to 122.85, 169.47 and 108.86
Half scale
Find fourth proportional to 491.39, 677.89 and 435.43
Double scale
Find fourth proportional to 246.69, 340.32 and 218.71
Similar ratio
Find fourth proportional to 368.54, 508.41 and 326.57
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.