Home / 39-58.50-10.50

Finding the Fourth Proportional to 39, 58.50 and 10.50

Calculator

Solution

The fourth proportional to 39, 58.50 and 10.50 is: 15.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    39 : 58.50 = 10.50 : x
  2. Step 2: Convert to fraction form
    39/58.50 = 10.50/x
  3. Step 3: Cross multiply
    39x = 58.50 × 10.50
  4. Step 4: Simplify right side
    39x = 614.25
  5. Step 5: Solve for x
    x = 614.25/39
  6. Step 6: Final answer
    x = 15.75

Related Problems

Find fourth proportional to 19.50, 29.25 and 5.25
Half scale
Find fourth proportional to 78, 117 and 21
Double scale
Find fourth proportional to 40, 60 and 11.50
Similar ratio
Find fourth proportional to 58.50, 87.75 and 15.75
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.