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Finding the Fourth Proportional to 627.60, 865.92 and 431.28

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Solution

The fourth proportional to 627.60, 865.92 and 431.28 is: 595.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.60 : 865.92 = 431.28 : x
  2. Step 2: Convert to fraction form
    627.60/865.92 = 431.28/x
  3. Step 3: Cross multiply
    627.60x = 865.92 × 431.28
  4. Step 4: Simplify right side
    627.60x = 373,453.98
  5. Step 5: Solve for x
    x = 373,453.98/627.60
  6. Step 6: Final answer
    x = 595.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.