Home / 352.80-486.48-290.55

Finding the Fourth Proportional to 352.80, 486.48 and 290.55

Calculator

Solution

The fourth proportional to 352.80, 486.48 and 290.55 is: 400.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    352.80 : 486.48 = 290.55 : x
  2. Step 2: Convert to fraction form
    352.80/486.48 = 290.55/x
  3. Step 3: Cross multiply
    352.80x = 486.48 × 290.55
  4. Step 4: Simplify right side
    352.80x = 141,346.76
  5. Step 5: Solve for x
    x = 141,346.76/352.80
  6. Step 6: Final answer
    x = 400.64

Related Problems

Find fourth proportional to 176.40, 243.24 and 145.28
Half scale
Find fourth proportional to 705.60, 972.96 and 581.10
Double scale
Find fourth proportional to 353.80, 487.86 and 291.55
Similar ratio
Find fourth proportional to 529.20, 729.72 and 435.83
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.