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Finding the Fourth Proportional to 618,931.80, 928,208.48 and 428,033.56

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Solution

The fourth proportional to 618,931.80, 928,208.48 and 428,033.56 is: 641,919.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    618,931.80 : 928,208.48 = 428,033.56 : x
  2. Step 2: Convert to fraction form
    618,931.80/928,208.48 = 428,033.56/x
  3. Step 3: Cross multiply
    618,931.80x = 928,208.48 × 428,033.56
  4. Step 4: Simplify right side
    618,931.80x = 397,304,380,116.59
  5. Step 5: Solve for x
    x = 397,304,380,116.59/618,931.80
  6. Step 6: Final answer
    x = 641,919.48

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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.