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Finding the Fourth Proportional to 289.90, 434.76 and 135.73

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Solution

The fourth proportional to 289.90, 434.76 and 135.73 is: 203.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.90 : 434.76 = 135.73 : x
  2. Step 2: Convert to fraction form
    289.90/434.76 = 135.73/x
  3. Step 3: Cross multiply
    289.90x = 434.76 × 135.73
  4. Step 4: Simplify right side
    289.90x = 59,009.97
  5. Step 5: Solve for x
    x = 59,009.97/289.90
  6. Step 6: Final answer
    x = 203.55

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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.