Home / 356.32-490.18-290.68

Finding the Fourth Proportional to 356.32, 490.18 and 290.68

Calculator

Solution

The fourth proportional to 356.32, 490.18 and 290.68 is: 399.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.32 : 490.18 = 290.68 : x
  2. Step 2: Convert to fraction form
    356.32/490.18 = 290.68/x
  3. Step 3: Cross multiply
    356.32x = 490.18 × 290.68
  4. Step 4: Simplify right side
    356.32x = 142,485.52
  5. Step 5: Solve for x
    x = 142,485.52/356.32
  6. Step 6: Final answer
    x = 399.88

Related Problems

Find fourth proportional to 178.16, 245.09 and 145.34
Half scale
Find fourth proportional to 712.64, 980.36 and 581.36
Double scale
Find fourth proportional to 357.32, 491.56 and 291.68
Similar ratio
Find fourth proportional to 534.48, 735.27 and 436.02
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.