Home / 483.18-721.31-421.70

Finding the Fourth Proportional to 483.18, 721.31 and 421.70

Calculator

Solution

The fourth proportional to 483.18, 721.31 and 421.70 is: 629.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    483.18 : 721.31 = 421.70 : x
  2. Step 2: Convert to fraction form
    483.18/721.31 = 421.70/x
  3. Step 3: Cross multiply
    483.18x = 721.31 × 421.70
  4. Step 4: Simplify right side
    483.18x = 304,170.71
  5. Step 5: Solve for x
    x = 304,170.71/483.18
  6. Step 6: Final answer
    x = 629.52

Related Problems

Find fourth proportional to 241.59, 360.65 and 210.85
Half scale
Find fourth proportional to 966.36, 1,442.61 and 843.39
Double scale
Find fourth proportional to 484.18, 722.80 and 422.70
Similar ratio
Find fourth proportional to 724.77, 1,081.96 and 632.54
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.