Home / 1,389.76-1,917.78-830.25

Finding the Fourth Proportional to 1,389.76, 1,917.78 and 830.25

Calculator

Solution

The fourth proportional to 1,389.76, 1,917.78 and 830.25 is: 1,145.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.76 : 1,917.78 = 830.25 : x
  2. Step 2: Convert to fraction form
    1,389.76/1,917.78 = 830.25/x
  3. Step 3: Cross multiply
    1,389.76x = 1,917.78 × 830.25
  4. Step 4: Simplify right side
    1,389.76x = 1,592,233.73
  5. Step 5: Solve for x
    x = 1,592,233.73/1,389.76
  6. Step 6: Final answer
    x = 1,145.69

Related Problems

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.