Home / 905.87-1,250.18-570

Finding the Fourth Proportional to 905.87, 1,250.18 and 570

Calculator

Solution

The fourth proportional to 905.87, 1,250.18 and 570 is: 786.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.87 : 1,250.18 = 570 : x
  2. Step 2: Convert to fraction form
    905.87/1,250.18 = 570/x
  3. Step 3: Cross multiply
    905.87x = 1,250.18 × 570
  4. Step 4: Simplify right side
    905.87x = 712,599.75
  5. Step 5: Solve for x
    x = 712,599.75/905.87
  6. Step 6: Final answer
    x = 786.65

Related Problems

Find fourth proportional to 452.93, 625.09 and 285
Half scale
Find fourth proportional to 1,811.73, 2,500.35 and 1,140
Double scale
Find fourth proportional to 906.87, 1,251.56 and 571
Similar ratio
Find fourth proportional to 1,358.80, 1,875.26 and 855
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.