Home / 978.32-1,347.72-667.28

Finding the Fourth Proportional to 978.32, 1,347.72 and 667.28

Calculator

Solution

The fourth proportional to 978.32, 1,347.72 and 667.28 is: 919.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.32 : 1,347.72 = 667.28 : x
  2. Step 2: Convert to fraction form
    978.32/1,347.72 = 667.28/x
  3. Step 3: Cross multiply
    978.32x = 1,347.72 × 667.28
  4. Step 4: Simplify right side
    978.32x = 899,306.60
  5. Step 5: Solve for x
    x = 899,306.60/978.32
  6. Step 6: Final answer
    x = 919.24

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.