Home / 918.87-1,378.50-625.65

Finding the Fourth Proportional to 918.87, 1,378.50 and 625.65

Calculator

Solution

The fourth proportional to 918.87, 1,378.50 and 625.65 is: 938.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.87 : 1,378.50 = 625.65 : x
  2. Step 2: Convert to fraction form
    918.87/1,378.50 = 625.65/x
  3. Step 3: Cross multiply
    918.87x = 1,378.50 × 625.65
  4. Step 4: Simplify right side
    918.87x = 862,458.53
  5. Step 5: Solve for x
    x = 862,458.53/918.87
  6. Step 6: Final answer
    x = 938.61

Related Problems

Find fourth proportional to 459.44, 689.25 and 312.83
Half scale
Find fourth proportional to 1,837.74, 2,757 and 1,251.30
Double scale
Find fourth proportional to 919.87, 1,380 and 626.65
Similar ratio
Find fourth proportional to 1,378.31, 2,067.75 and 938.48
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.