Home / 278,301.20-390,409-278,301.20

Finding the Fourth Proportional to 278,301.20, 390,409 and 278,301.20

Calculator

Solution

The fourth proportional to 278,301.20, 390,409 and 278,301.20 is: 390,409

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,301.20 : 390,409 = 278,301.20 : x
  2. Step 2: Convert to fraction form
    278,301.20/390,409 = 278,301.20/x
  3. Step 3: Cross multiply
    278,301.20x = 390,409 × 278,301.20
  4. Step 4: Simplify right side
    278,301.20x = 108,651,293,190.80
  5. Step 5: Solve for x
    x = 108,651,293,190.80/278,301.20
  6. Step 6: Final answer
    x = 390,409

Related Problems

Find fourth proportional to 139,150.60, 195,204.50 and 139,150.60
Half scale
Find fourth proportional to 556,602.40, 780,818 and 556,602.40
Double scale
Find fourth proportional to 278,302.20, 390,410.40 and 278,302.20
Similar ratio
Find fourth proportional to 417,451.80, 585,613.50 and 417,451.80
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.