Home / 648-972-404.40

Finding the Fourth Proportional to 648, 972 and 404.40

Calculator

Solution

The fourth proportional to 648, 972 and 404.40 is: 606.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    648 : 972 = 404.40 : x
  2. Step 2: Convert to fraction form
    648/972 = 404.40/x
  3. Step 3: Cross multiply
    648x = 972 × 404.40
  4. Step 4: Simplify right side
    648x = 393,076.80
  5. Step 5: Solve for x
    x = 393,076.80/648
  6. Step 6: Final answer
    x = 606.60

Related Problems

Find fourth proportional to 324, 486 and 202.20
Half scale
Find fourth proportional to 1,296, 1,944 and 808.80
Double scale
Find fourth proportional to 649, 973.50 and 405.40
Similar ratio
Find fourth proportional to 972, 1,458 and 606.60
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.