Home / 357.39-493.29-278.55

Finding the Fourth Proportional to 357.39, 493.29 and 278.55

Calculator

Solution

The fourth proportional to 357.39, 493.29 and 278.55 is: 384.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    357.39 : 493.29 = 278.55 : x
  2. Step 2: Convert to fraction form
    357.39/493.29 = 278.55/x
  3. Step 3: Cross multiply
    357.39x = 493.29 × 278.55
  4. Step 4: Simplify right side
    357.39x = 137,405.93
  5. Step 5: Solve for x
    x = 137,405.93/357.39
  6. Step 6: Final answer
    x = 384.47

Related Problems

Find fourth proportional to 178.70, 246.65 and 139.28
Half scale
Find fourth proportional to 714.78, 986.58 and 557.10
Double scale
Find fourth proportional to 358.39, 494.67 and 279.55
Similar ratio
Find fourth proportional to 536.09, 739.94 and 417.83
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.