Home / 780.47-1,170.30-260.28

Finding the Fourth Proportional to 780.47, 1,170.30 and 260.28

Calculator

Solution

The fourth proportional to 780.47, 1,170.30 and 260.28 is: 390.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.47 : 1,170.30 = 260.28 : x
  2. Step 2: Convert to fraction form
    780.47/1,170.30 = 260.28/x
  3. Step 3: Cross multiply
    780.47x = 1,170.30 × 260.28
  4. Step 4: Simplify right side
    780.47x = 304,605.68
  5. Step 5: Solve for x
    x = 304,605.68/780.47
  6. Step 6: Final answer
    x = 390.29

Related Problems

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.