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Finding the Fourth Proportional to 627.32, 939.12 and 421.36

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Solution

The fourth proportional to 627.32, 939.12 and 421.36 is: 630.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    627.32 : 939.12 = 421.36 : x
  2. Step 2: Convert to fraction form
    627.32/939.12 = 421.36/x
  3. Step 3: Cross multiply
    627.32x = 939.12 × 421.36
  4. Step 4: Simplify right side
    627.32x = 395,707.60
  5. Step 5: Solve for x
    x = 395,707.60/627.32
  6. Step 6: Final answer
    x = 630.79

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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.