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Finding the Fourth Proportional to 630.21, 942.89 and 423.80

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Solution

The fourth proportional to 630.21, 942.89 and 423.80 is: 634.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.21 : 942.89 = 423.80 : x
  2. Step 2: Convert to fraction form
    630.21/942.89 = 423.80/x
  3. Step 3: Cross multiply
    630.21x = 942.89 × 423.80
  4. Step 4: Simplify right side
    630.21x = 399,589.95
  5. Step 5: Solve for x
    x = 399,589.95/630.21
  6. Step 6: Final answer
    x = 634.06

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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.