Home / 691.04-1,036.20-434

Finding the Fourth Proportional to 691.04, 1,036.20 and 434

Calculator

Solution

The fourth proportional to 691.04, 1,036.20 and 434 is: 650.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.04 : 1,036.20 = 434 : x
  2. Step 2: Convert to fraction form
    691.04/1,036.20 = 434/x
  3. Step 3: Cross multiply
    691.04x = 1,036.20 × 434
  4. Step 4: Simplify right side
    691.04x = 449,710.80
  5. Step 5: Solve for x
    x = 449,710.80/691.04
  6. Step 6: Final answer
    x = 650.77

Related Problems

Find fourth proportional to 345.52, 518.10 and 217
Half scale
Find fourth proportional to 1,382.08, 2,072.40 and 868
Double scale
Find fourth proportional to 692.04, 1,037.70 and 435
Similar ratio
Find fourth proportional to 1,036.56, 1,554.30 and 651
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.