Home / 787.08-1,180.20-354

Finding the Fourth Proportional to 787.08, 1,180.20 and 354

Calculator

Solution

The fourth proportional to 787.08, 1,180.20 and 354 is: 530.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.08 : 1,180.20 = 354 : x
  2. Step 2: Convert to fraction form
    787.08/1,180.20 = 354/x
  3. Step 3: Cross multiply
    787.08x = 1,180.20 × 354
  4. Step 4: Simplify right side
    787.08x = 417,790.80
  5. Step 5: Solve for x
    x = 417,790.80/787.08
  6. Step 6: Final answer
    x = 530.81

Related Problems

Find fourth proportional to 393.54, 590.10 and 177
Half scale
Find fourth proportional to 1,574.16, 2,360.40 and 708
Double scale
Find fourth proportional to 788.08, 1,181.70 and 355
Similar ratio
Find fourth proportional to 1,180.62, 1,770.30 and 531
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.