Home / 60.30-90.30-39.90

Finding the Fourth Proportional to 60.30, 90.30 and 39.90

Calculator

Solution

The fourth proportional to 60.30, 90.30 and 39.90 is: 59.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.30 : 90.30 = 39.90 : x
  2. Step 2: Convert to fraction form
    60.30/90.30 = 39.90/x
  3. Step 3: Cross multiply
    60.30x = 90.30 × 39.90
  4. Step 4: Simplify right side
    60.30x = 3,602.97
  5. Step 5: Solve for x
    x = 3,602.97/60.30
  6. Step 6: Final answer
    x = 59.75

Related Problems

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.