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Finding the Fourth Proportional to 423.89, 635.43 and 135.13

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Solution

The fourth proportional to 423.89, 635.43 and 135.13 is: 202.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.89 : 635.43 = 135.13 : x
  2. Step 2: Convert to fraction form
    423.89/635.43 = 135.13/x
  3. Step 3: Cross multiply
    423.89x = 635.43 × 135.13
  4. Step 4: Simplify right side
    423.89x = 85,865.66
  5. Step 5: Solve for x
    x = 85,865.66/423.89
  6. Step 6: Final answer
    x = 202.57

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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.