Home / 407-561.70-251.78

Finding the Fourth Proportional to 407, 561.70 and 251.78

Calculator

Solution

The fourth proportional to 407, 561.70 and 251.78 is: 347.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    407 : 561.70 = 251.78 : x
  2. Step 2: Convert to fraction form
    407/561.70 = 251.78/x
  3. Step 3: Cross multiply
    407x = 561.70 × 251.78
  4. Step 4: Simplify right side
    407x = 141,424.83
  5. Step 5: Solve for x
    x = 141,424.83/407
  6. Step 6: Final answer
    x = 347.48

Related Problems

Find fourth proportional to 203.50, 280.85 and 125.89
Half scale
Find fourth proportional to 814, 1,123.40 and 503.56
Double scale
Find fourth proportional to 408, 563.08 and 252.78
Similar ratio
Find fourth proportional to 610.50, 842.55 and 377.67
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.