Home / 971.42-1,339.61-784.78

Finding the Fourth Proportional to 971.42, 1,339.61 and 784.78

Calculator

Solution

The fourth proportional to 971.42, 1,339.61 and 784.78 is: 1,082.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    971.42 : 1,339.61 = 784.78 : x
  2. Step 2: Convert to fraction form
    971.42/1,339.61 = 784.78/x
  3. Step 3: Cross multiply
    971.42x = 1,339.61 × 784.78
  4. Step 4: Simplify right side
    971.42x = 1,051,291.86
  5. Step 5: Solve for x
    x = 1,051,291.86/971.42
  6. Step 6: Final answer
    x = 1,082.23

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.