Home / 351.50-485.34-278.20

Finding the Fourth Proportional to 351.50, 485.34 and 278.20

Calculator

Solution

The fourth proportional to 351.50, 485.34 and 278.20 is: 384.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.50 : 485.34 = 278.20 : x
  2. Step 2: Convert to fraction form
    351.50/485.34 = 278.20/x
  3. Step 3: Cross multiply
    351.50x = 485.34 × 278.20
  4. Step 4: Simplify right side
    351.50x = 135,019.16
  5. Step 5: Solve for x
    x = 135,019.16/351.50
  6. Step 6: Final answer
    x = 384.12

Related Problems

Find fourth proportional to 175.75, 242.67 and 139.10
Half scale
Find fourth proportional to 703, 970.68 and 556.39
Double scale
Find fourth proportional to 352.50, 486.72 and 279.20
Similar ratio
Find fourth proportional to 527.25, 728.01 and 417.29
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.