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Finding the Fourth Proportional to 633.21, 947.37 and 426.81

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Solution

The fourth proportional to 633.21, 947.37 and 426.81 is: 638.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    633.21 : 947.37 = 426.81 : x
  2. Step 2: Convert to fraction form
    633.21/947.37 = 426.81/x
  3. Step 3: Cross multiply
    633.21x = 947.37 × 426.81
  4. Step 4: Simplify right side
    633.21x = 404,346.99
  5. Step 5: Solve for x
    x = 404,346.99/633.21
  6. Step 6: Final answer
    x = 638.57

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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.