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Finding the Fourth Proportional to 402,198.90, 603,626.40 and 389,076.90

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Solution

The fourth proportional to 402,198.90, 603,626.40 and 389,076.90 is: 583,932.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,198.90 : 603,626.40 = 389,076.90 : x
  2. Step 2: Convert to fraction form
    402,198.90/603,626.40 = 389,076.90/x
  3. Step 3: Cross multiply
    402,198.90x = 603,626.40 × 389,076.90
  4. Step 4: Simplify right side
    402,198.90x = 234,857,088,470.16
  5. Step 5: Solve for x
    x = 234,857,088,470.16/402,198.90
  6. Step 6: Final answer
    x = 583,932.70

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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.