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Finding the Fourth Proportional to 638,423.20, 955,791.60 and 389,591.20

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Solution

The fourth proportional to 638,423.20, 955,791.60 and 389,591.20 is: 583,262.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,423.20 : 955,791.60 = 389,591.20 : x
  2. Step 2: Convert to fraction form
    638,423.20/955,791.60 = 389,591.20/x
  3. Step 3: Cross multiply
    638,423.20x = 955,791.60 × 389,591.20
  4. Step 4: Simplify right side
    638,423.20x = 372,367,996,393.92
  5. Step 5: Solve for x
    x = 372,367,996,393.92/638,423.20
  6. Step 6: Final answer
    x = 583,262.01

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1.5x scale

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.