Home / 90.48-124.78-74.80

Finding the Fourth Proportional to 90.48, 124.78 and 74.80

Calculator

Solution

The fourth proportional to 90.48, 124.78 and 74.80 is: 103.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.48 : 124.78 = 74.80 : x
  2. Step 2: Convert to fraction form
    90.48/124.78 = 74.80/x
  3. Step 3: Cross multiply
    90.48x = 124.78 × 74.80
  4. Step 4: Simplify right side
    90.48x = 9,333.54
  5. Step 5: Solve for x
    x = 9,333.54/90.48
  6. Step 6: Final answer
    x = 103.16

Related Problems

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.