Home / 621.75-858-342

Finding the Fourth Proportional to 621.75, 858 and 342

Calculator

Solution

The fourth proportional to 621.75, 858 and 342 is: 471.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.75 : 858 = 342 : x
  2. Step 2: Convert to fraction form
    621.75/858 = 342/x
  3. Step 3: Cross multiply
    621.75x = 858 × 342
  4. Step 4: Simplify right side
    621.75x = 293,436
  5. Step 5: Solve for x
    x = 293,436/621.75
  6. Step 6: Final answer
    x = 471.95

Related Problems

Find fourth proportional to 310.88, 429 and 171
Half scale
Find fourth proportional to 1,243.50, 1,716 and 684
Double scale
Find fourth proportional to 622.75, 859.38 and 343
Similar ratio
Find fourth proportional to 932.63, 1,287 and 513
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.