Home / 448-618.28-290.68

Finding the Fourth Proportional to 448, 618.28 and 290.68

Calculator

Solution

The fourth proportional to 448, 618.28 and 290.68 is: 401.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    448 : 618.28 = 290.68 : x
  2. Step 2: Convert to fraction form
    448/618.28 = 290.68/x
  3. Step 3: Cross multiply
    448x = 618.28 × 290.68
  4. Step 4: Simplify right side
    448x = 179,721.63
  5. Step 5: Solve for x
    x = 179,721.63/448
  6. Step 6: Final answer
    x = 401.16

Related Problems

Find fourth proportional to 224, 309.14 and 145.34
Half scale
Find fourth proportional to 896, 1,236.56 and 581.36
Double scale
Find fourth proportional to 449, 619.66 and 291.68
Similar ratio
Find fourth proportional to 672, 927.42 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.