Home / 375.78-518.15-281.28

Finding the Fourth Proportional to 375.78, 518.15 and 281.28

Calculator

Solution

The fourth proportional to 375.78, 518.15 and 281.28 is: 387.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    375.78 : 518.15 = 281.28 : x
  2. Step 2: Convert to fraction form
    375.78/518.15 = 281.28/x
  3. Step 3: Cross multiply
    375.78x = 518.15 × 281.28
  4. Step 4: Simplify right side
    375.78x = 145,743.83
  5. Step 5: Solve for x
    x = 145,743.83/375.78
  6. Step 6: Final answer
    x = 387.84

Related Problems

Find fourth proportional to 187.89, 259.07 and 140.64
Half scale
Find fourth proportional to 751.56, 1,036.29 and 562.56
Double scale
Find fourth proportional to 376.78, 519.52 and 282.28
Similar ratio
Find fourth proportional to 563.67, 777.22 and 421.92
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.