Home / 1,258.62-1,888-478.56

Finding the Fourth Proportional to 1,258.62, 1,888 and 478.56

Calculator

Solution

The fourth proportional to 1,258.62, 1,888 and 478.56 is: 717.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.62 : 1,888 = 478.56 : x
  2. Step 2: Convert to fraction form
    1,258.62/1,888 = 478.56/x
  3. Step 3: Cross multiply
    1,258.62x = 1,888 × 478.56
  4. Step 4: Simplify right side
    1,258.62x = 903,521.28
  5. Step 5: Solve for x
    x = 903,521.28/1,258.62
  6. Step 6: Final answer
    x = 717.87

Related Problems

Find fourth proportional to 629.31, 944 and 239.28
Half scale
Find fourth proportional to 2,517.24, 3,776 and 957.12
Double scale
Find fourth proportional to 1,259.62, 1,889.50 and 479.56
Similar ratio
Find fourth proportional to 1,887.93, 2,832 and 717.84
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.