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Finding the Fourth Proportional to 289.89, 434.75 and 135.73

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Solution

The fourth proportional to 289.89, 434.75 and 135.73 is: 203.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.89 : 434.75 = 135.73 : x
  2. Step 2: Convert to fraction form
    289.89/434.75 = 135.73/x
  3. Step 3: Cross multiply
    289.89x = 434.75 × 135.73
  4. Step 4: Simplify right side
    289.89x = 59,008.99
  5. Step 5: Solve for x
    x = 59,008.99/289.89
  6. Step 6: Final answer
    x = 203.56

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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.