Home / 1,368.52-2,052.80-638

Finding the Fourth Proportional to 1,368.52, 2,052.80 and 638

Calculator

Solution

The fourth proportional to 1,368.52, 2,052.80 and 638 is: 957.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368.52 : 2,052.80 = 638 : x
  2. Step 2: Convert to fraction form
    1,368.52/2,052.80 = 638/x
  3. Step 3: Cross multiply
    1,368.52x = 2,052.80 × 638
  4. Step 4: Simplify right side
    1,368.52x = 1,309,686.40
  5. Step 5: Solve for x
    x = 1,309,686.40/1,368.52
  6. Step 6: Final answer
    x = 957.01

Related Problems

Find fourth proportional to 684.26, 1,026.40 and 319
Half scale
Find fourth proportional to 2,737.04, 4,105.60 and 1,276
Double scale
Find fourth proportional to 1,369.52, 2,054.30 and 639
Similar ratio
Find fourth proportional to 2,052.78, 3,079.20 and 957
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.