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Finding the Fourth Proportional to 634.32, 949.62 and 428.36

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Solution

The fourth proportional to 634.32, 949.62 and 428.36 is: 641.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    634.32 : 949.62 = 428.36 : x
  2. Step 2: Convert to fraction form
    634.32/949.62 = 428.36/x
  3. Step 3: Cross multiply
    634.32x = 949.62 × 428.36
  4. Step 4: Simplify right side
    634.32x = 406,779.22
  5. Step 5: Solve for x
    x = 406,779.22/634.32
  6. Step 6: Final answer
    x = 641.28

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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.