Home / 489-732.78-326.28

Finding the Fourth Proportional to 489, 732.78 and 326.28

Calculator

Solution

The fourth proportional to 489, 732.78 and 326.28 is: 488.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    489 : 732.78 = 326.28 : x
  2. Step 2: Convert to fraction form
    489/732.78 = 326.28/x
  3. Step 3: Cross multiply
    489x = 732.78 × 326.28
  4. Step 4: Simplify right side
    489x = 239,091.46
  5. Step 5: Solve for x
    x = 239,091.46/489
  6. Step 6: Final answer
    x = 488.94

Related Problems

Find fourth proportional to 244.50, 366.39 and 163.14
Half scale
Find fourth proportional to 978, 1,465.56 and 652.56
Double scale
Find fourth proportional to 490, 734.28 and 327.28
Similar ratio
Find fourth proportional to 733.50, 1,099.17 and 489.42
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.