Home / 375.20-517.79-217.85

Finding the Fourth Proportional to 375.20, 517.79 and 217.85

Calculator

Solution

The fourth proportional to 375.20, 517.79 and 217.85 is: 300.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    375.20 : 517.79 = 217.85 : x
  2. Step 2: Convert to fraction form
    375.20/517.79 = 217.85/x
  3. Step 3: Cross multiply
    375.20x = 517.79 × 217.85
  4. Step 4: Simplify right side
    375.20x = 112,798.17
  5. Step 5: Solve for x
    x = 112,798.17/375.20
  6. Step 6: Final answer
    x = 300.63

Related Problems

Find fourth proportional to 187.60, 258.89 and 108.92
Half scale
Find fourth proportional to 750.41, 1,035.57 and 435.70
Double scale
Find fourth proportional to 376.20, 519.17 and 218.85
Similar ratio
Find fourth proportional to 562.80, 776.68 and 326.77
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.