Home / 525.68-725.40-289.60

Finding the Fourth Proportional to 525.68, 725.40 and 289.60

Calculator

Solution

The fourth proportional to 525.68, 725.40 and 289.60 is: 399.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    525.68 : 725.40 = 289.60 : x
  2. Step 2: Convert to fraction form
    525.68/725.40 = 289.60/x
  3. Step 3: Cross multiply
    525.68x = 725.40 × 289.60
  4. Step 4: Simplify right side
    525.68x = 210,075.84
  5. Step 5: Solve for x
    x = 210,075.84/525.68
  6. Step 6: Final answer
    x = 399.63

Related Problems

Find fourth proportional to 262.84, 362.70 and 144.80
Half scale
Find fourth proportional to 1,051.36, 1,450.80 and 579.20
Double scale
Find fourth proportional to 526.68, 726.78 and 290.60
Similar ratio
Find fourth proportional to 788.52, 1,088.10 and 434.40
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.