Home / 374.78-561.98-218.66

Finding the Fourth Proportional to 374.78, 561.98 and 218.66

Calculator

Solution

The fourth proportional to 374.78, 561.98 and 218.66 is: 327.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.78 : 561.98 = 218.66 : x
  2. Step 2: Convert to fraction form
    374.78/561.98 = 218.66/x
  3. Step 3: Cross multiply
    374.78x = 561.98 × 218.66
  4. Step 4: Simplify right side
    374.78x = 122,879.05
  5. Step 5: Solve for x
    x = 122,879.05/374.78
  6. Step 6: Final answer
    x = 327.87

Related Problems

Find fourth proportional to 187.39, 280.99 and 109.33
Half scale
Find fourth proportional to 749.55, 1,123.95 and 437.31
Double scale
Find fourth proportional to 375.78, 563.48 and 219.66
Similar ratio
Find fourth proportional to 562.17, 842.97 and 327.98
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.