Home / 656-905.40-380

Finding the Fourth Proportional to 656, 905.40 and 380

Calculator

Solution

The fourth proportional to 656, 905.40 and 380 is: 524.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    656 : 905.40 = 380 : x
  2. Step 2: Convert to fraction form
    656/905.40 = 380/x
  3. Step 3: Cross multiply
    656x = 905.40 × 380
  4. Step 4: Simplify right side
    656x = 344,052
  5. Step 5: Solve for x
    x = 344,052/656
  6. Step 6: Final answer
    x = 524.47

Related Problems

Find fourth proportional to 328, 452.70 and 190
Half scale
Find fourth proportional to 1,312, 1,810.80 and 760
Double scale
Find fourth proportional to 657, 906.78 and 381
Similar ratio
Find fourth proportional to 984, 1,358.10 and 570
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.