Home / 1,128.60-1,557.40-631.15

Finding the Fourth Proportional to 1,128.60, 1,557.40 and 631.15

Calculator

Solution

The fourth proportional to 1,128.60, 1,557.40 and 631.15 is: 870.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.60 : 1,557.40 = 631.15 : x
  2. Step 2: Convert to fraction form
    1,128.60/1,557.40 = 631.15/x
  3. Step 3: Cross multiply
    1,128.60x = 1,557.40 × 631.15
  4. Step 4: Simplify right side
    1,128.60x = 982,955.12
  5. Step 5: Solve for x
    x = 982,955.12/1,128.60
  6. Step 6: Final answer
    x = 870.95

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.