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Finding the Fourth Proportional to 638,449.20, 955,830.60 and 389,617.20

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Solution

The fourth proportional to 638,449.20, 955,830.60 and 389,617.20 is: 583,300.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,449.20 : 955,830.60 = 389,617.20 : x
  2. Step 2: Convert to fraction form
    638,449.20/955,830.60 = 389,617.20/x
  3. Step 3: Cross multiply
    638,449.20x = 955,830.60 × 389,617.20
  4. Step 4: Simplify right side
    638,449.20x = 372,408,042,046.32
  5. Step 5: Solve for x
    x = 372,408,042,046.32/638,449.20
  6. Step 6: Final answer
    x = 583,300.98

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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.