Home / 858-1,287.30-425.46

Finding the Fourth Proportional to 858, 1,287.30 and 425.46

Calculator

Solution

The fourth proportional to 858, 1,287.30 and 425.46 is: 638.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    858 : 1,287.30 = 425.46 : x
  2. Step 2: Convert to fraction form
    858/1,287.30 = 425.46/x
  3. Step 3: Cross multiply
    858x = 1,287.30 × 425.46
  4. Step 4: Simplify right side
    858x = 547,694.66
  5. Step 5: Solve for x
    x = 547,694.66/858
  6. Step 6: Final answer
    x = 638.34

Related Problems

Find fourth proportional to 429, 643.65 and 212.73
Half scale
Find fourth proportional to 1,716, 2,574.60 and 850.92
Double scale
Find fourth proportional to 859, 1,288.80 and 426.46
Similar ratio
Find fourth proportional to 1,287, 1,930.95 and 638.19
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.