Home / 809,862.40-1,215,139.20-388,921.60

Finding the Fourth Proportional to 809,862.40, 1,215,139.20 and 388,921.60

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Solution

The fourth proportional to 809,862.40, 1,215,139.20 and 388,921.60 is: 583,548.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    809,862.40 : 1,215,139.20 = 388,921.60 : x
  2. Step 2: Convert to fraction form
    809,862.40/1,215,139.20 = 388,921.60/x
  3. Step 3: Cross multiply
    809,862.40x = 1,215,139.20 × 388,921.60
  4. Step 4: Simplify right side
    809,862.40x = 472,593,881,886.72
  5. Step 5: Solve for x
    x = 472,593,881,886.72/809,862.40
  6. Step 6: Final answer
    x = 583,548.37

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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.