Home / 570-786-395.28

Finding the Fourth Proportional to 570, 786 and 395.28

Calculator

Solution

The fourth proportional to 570, 786 and 395.28 is: 545.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    570 : 786 = 395.28 : x
  2. Step 2: Convert to fraction form
    570/786 = 395.28/x
  3. Step 3: Cross multiply
    570x = 786 × 395.28
  4. Step 4: Simplify right side
    570x = 310,690.08
  5. Step 5: Solve for x
    x = 310,690.08/570
  6. Step 6: Final answer
    x = 545.07

Related Problems

Find fourth proportional to 285, 393 and 197.64
Half scale
Find fourth proportional to 1,140, 1,572 and 790.56
Double scale
Find fourth proportional to 571, 787.38 and 396.28
Similar ratio
Find fourth proportional to 855, 1,179 and 592.92
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.