Home / 51-76.50-13

Finding the Fourth Proportional to 51, 76.50 and 13

Calculator

Solution

The fourth proportional to 51, 76.50 and 13 is: 19.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    51 : 76.50 = 13 : x
  2. Step 2: Convert to fraction form
    51/76.50 = 13/x
  3. Step 3: Cross multiply
    51x = 76.50 × 13
  4. Step 4: Simplify right side
    51x = 994.50
  5. Step 5: Solve for x
    x = 994.50/51
  6. Step 6: Final answer
    x = 19.50

Related Problems

Find fourth proportional to 25.50, 38.25 and 6.50
Half scale
Find fourth proportional to 102, 153 and 26
Double scale
Find fourth proportional to 52, 78 and 14
Similar ratio
Find fourth proportional to 76.50, 114.75 and 19.50
1.5x scale

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.