Home / 1,089.78-1,634.80-349.44

Finding the Fourth Proportional to 1,089.78, 1,634.80 and 349.44

Calculator

Solution

The fourth proportional to 1,089.78, 1,634.80 and 349.44 is: 524.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.78 : 1,634.80 = 349.44 : x
  2. Step 2: Convert to fraction form
    1,089.78/1,634.80 = 349.44/x
  3. Step 3: Cross multiply
    1,089.78x = 1,634.80 × 349.44
  4. Step 4: Simplify right side
    1,089.78x = 571,264.51
  5. Step 5: Solve for x
    x = 571,264.51/1,089.78
  6. Step 6: Final answer
    x = 524.20

Related Problems

Find fourth proportional to 544.89, 817.40 and 174.72
Half scale
Find fourth proportional to 2,179.56, 3,269.60 and 698.88
Double scale
Find fourth proportional to 1,090.78, 1,636.30 and 350.44
Similar ratio
Find fourth proportional to 1,634.67, 2,452.20 and 524.16
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.