Home / 471.15-648-381.51

Finding the Fourth Proportional to 471.15, 648 and 381.51

Calculator

Solution

The fourth proportional to 471.15, 648 and 381.51 is: 524.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    471.15 : 648 = 381.51 : x
  2. Step 2: Convert to fraction form
    471.15/648 = 381.51/x
  3. Step 3: Cross multiply
    471.15x = 648 × 381.51
  4. Step 4: Simplify right side
    471.15x = 247,218.48
  5. Step 5: Solve for x
    x = 247,218.48/471.15
  6. Step 6: Final answer
    x = 524.71

Related Problems

Find fourth proportional to 235.58, 324 and 190.76
Half scale
Find fourth proportional to 942.30, 1,296 and 763.02
Double scale
Find fourth proportional to 472.15, 649.38 and 382.51
Similar ratio
Find fourth proportional to 706.73, 972 and 572.27
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.