Home / 1,309.94-1,965.67-488.78

Finding the Fourth Proportional to 1,309.94, 1,965.67 and 488.78

Calculator

Solution

The fourth proportional to 1,309.94, 1,965.67 and 488.78 is: 733.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,309.94 : 1,965.67 = 488.78 : x
  2. Step 2: Convert to fraction form
    1,309.94/1,965.67 = 488.78/x
  3. Step 3: Cross multiply
    1,309.94x = 1,965.67 × 488.78
  4. Step 4: Simplify right side
    1,309.94x = 960,780.18
  5. Step 5: Solve for x
    x = 960,780.18/1,309.94
  6. Step 6: Final answer
    x = 733.45

Related Problems

Find fourth proportional to 654.97, 982.84 and 244.39
Half scale
Find fourth proportional to 2,619.88, 3,931.34 and 977.56
Double scale
Find fourth proportional to 1,310.94, 1,967.17 and 489.78
Similar ratio
Find fourth proportional to 1,964.91, 2,948.51 and 733.17
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.