Home / 643.90-888-468.94

Finding the Fourth Proportional to 643.90, 888 and 468.94

Calculator

Solution

The fourth proportional to 643.90, 888 and 468.94 is: 646.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.90 : 888 = 468.94 : x
  2. Step 2: Convert to fraction form
    643.90/888 = 468.94/x
  3. Step 3: Cross multiply
    643.90x = 888 × 468.94
  4. Step 4: Simplify right side
    643.90x = 416,418.72
  5. Step 5: Solve for x
    x = 416,418.72/643.90
  6. Step 6: Final answer
    x = 646.71

Related Problems

Find fourth proportional to 321.95, 444 and 234.47
Half scale
Find fourth proportional to 1,287.80, 1,776 and 937.88
Double scale
Find fourth proportional to 644.90, 889.38 and 469.94
Similar ratio
Find fourth proportional to 965.85, 1,332 and 703.41
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.