Home / 599.80-828.50-490.60

Finding the Fourth Proportional to 599.80, 828.50 and 490.60

Calculator

Solution

The fourth proportional to 599.80, 828.50 and 490.60 is: 677.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    599.80 : 828.50 = 490.60 : x
  2. Step 2: Convert to fraction form
    599.80/828.50 = 490.60/x
  3. Step 3: Cross multiply
    599.80x = 828.50 × 490.60
  4. Step 4: Simplify right side
    599.80x = 406,462.10
  5. Step 5: Solve for x
    x = 406,462.10/599.80
  6. Step 6: Final answer
    x = 677.66

Related Problems

Find fourth proportional to 299.90, 414.25 and 245.30
Half scale
Find fourth proportional to 1,199.60, 1,657 and 981.20
Double scale
Find fourth proportional to 600.80, 829.88 and 491.60
Similar ratio
Find fourth proportional to 899.70, 1,242.75 and 735.90
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.