Home / 393-542.50-255.40

Finding the Fourth Proportional to 393, 542.50 and 255.40

Calculator

Solution

The fourth proportional to 393, 542.50 and 255.40 is: 352.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    393 : 542.50 = 255.40 : x
  2. Step 2: Convert to fraction form
    393/542.50 = 255.40/x
  3. Step 3: Cross multiply
    393x = 542.50 × 255.40
  4. Step 4: Simplify right side
    393x = 138,554.50
  5. Step 5: Solve for x
    x = 138,554.50/393
  6. Step 6: Final answer
    x = 352.56

Related Problems

Find fourth proportional to 196.50, 271.25 and 127.70
Half scale
Find fourth proportional to 786, 1,085 and 510.80
Double scale
Find fourth proportional to 394, 543.88 and 256.40
Similar ratio
Find fourth proportional to 589.50, 813.75 and 383.10
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.