Home / 462.28-690.05-428.02

Finding the Fourth Proportional to 462.28, 690.05 and 428.02

Calculator

Solution

The fourth proportional to 462.28, 690.05 and 428.02 is: 638.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.28 : 690.05 = 428.02 : x
  2. Step 2: Convert to fraction form
    462.28/690.05 = 428.02/x
  3. Step 3: Cross multiply
    462.28x = 690.05 × 428.02
  4. Step 4: Simplify right side
    462.28x = 295,355.20
  5. Step 5: Solve for x
    x = 295,355.20/462.28
  6. Step 6: Final answer
    x = 638.91

Related Problems

Find fourth proportional to 231.14, 345.03 and 214.01
Half scale
Find fourth proportional to 924.56, 1,380.10 and 856.04
Double scale
Find fourth proportional to 463.28, 691.54 and 429.02
Similar ratio
Find fourth proportional to 693.42, 1,035.08 and 642.03
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.