Home / 873.15-1,309.89-256.86

Finding the Fourth Proportional to 873.15, 1,309.89 and 256.86

Calculator

Solution

The fourth proportional to 873.15, 1,309.89 and 256.86 is: 385.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.15 : 1,309.89 = 256.86 : x
  2. Step 2: Convert to fraction form
    873.15/1,309.89 = 256.86/x
  3. Step 3: Cross multiply
    873.15x = 1,309.89 × 256.86
  4. Step 4: Simplify right side
    873.15x = 336,458.35
  5. Step 5: Solve for x
    x = 336,458.35/873.15
  6. Step 6: Final answer
    x = 385.34

Related Problems

Find fourth proportional to 436.58, 654.95 and 128.43
Half scale
Find fourth proportional to 1,746.30, 2,619.78 and 513.72
Double scale
Find fourth proportional to 874.15, 1,311.39 and 257.86
Similar ratio
Find fourth proportional to 1,309.73, 1,964.84 and 385.29
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.