Home / 1,282.70-1,924-405.20

Finding the Fourth Proportional to 1,282.70, 1,924 and 405.20

Calculator

Solution

The fourth proportional to 1,282.70, 1,924 and 405.20 is: 607.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,282.70 : 1,924 = 405.20 : x
  2. Step 2: Convert to fraction form
    1,282.70/1,924 = 405.20/x
  3. Step 3: Cross multiply
    1,282.70x = 1,924 × 405.20
  4. Step 4: Simplify right side
    1,282.70x = 779,604.80
  5. Step 5: Solve for x
    x = 779,604.80/1,282.70
  6. Step 6: Final answer
    x = 607.78

Related Problems

Find fourth proportional to 641.35, 962 and 202.60
Half scale
Find fourth proportional to 2,565.40, 3,848 and 810.40
Double scale
Find fourth proportional to 1,283.70, 1,925.50 and 406.20
Similar ratio
Find fourth proportional to 1,924.05, 2,886 and 607.80
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.