Home / 1,985.24-2,978-752.42

Finding the Fourth Proportional to 1,985.24, 2,978 and 752.42

Calculator

Solution

The fourth proportional to 1,985.24, 2,978 and 752.42 is: 1,128.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.24 : 2,978 = 752.42 : x
  2. Step 2: Convert to fraction form
    1,985.24/2,978 = 752.42/x
  3. Step 3: Cross multiply
    1,985.24x = 2,978 × 752.42
  4. Step 4: Simplify right side
    1,985.24x = 2,240,706.76
  5. Step 5: Solve for x
    x = 2,240,706.76/1,985.24
  6. Step 6: Final answer
    x = 1,128.68

Related Problems

Find fourth proportional to 992.62, 1,489 and 376.21
Half scale
Find fourth proportional to 3,970.48, 5,956 and 1,504.84
Double scale
Find fourth proportional to 1,986.24, 2,979.50 and 753.42
Similar ratio
Find fourth proportional to 2,977.86, 4,467 and 1,128.63
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.