Home / 521-720-427.60

Finding the Fourth Proportional to 521, 720 and 427.60

Calculator

Solution

The fourth proportional to 521, 720 and 427.60 is: 590.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    521 : 720 = 427.60 : x
  2. Step 2: Convert to fraction form
    521/720 = 427.60/x
  3. Step 3: Cross multiply
    521x = 720 × 427.60
  4. Step 4: Simplify right side
    521x = 307,872
  5. Step 5: Solve for x
    x = 307,872/521
  6. Step 6: Final answer
    x = 590.93

Related Problems

Find fourth proportional to 260.50, 360 and 213.80
Half scale
Find fourth proportional to 1,042, 1,440 and 855.20
Double scale
Find fourth proportional to 522, 721.38 and 428.60
Similar ratio
Find fourth proportional to 781.50, 1,080 and 641.40
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.