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Finding the Fourth Proportional to 289.76, 434.56 and 135.61

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Solution

The fourth proportional to 289.76, 434.56 and 135.61 is: 203.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.76 : 434.56 = 135.61 : x
  2. Step 2: Convert to fraction form
    289.76/434.56 = 135.61/x
  3. Step 3: Cross multiply
    289.76x = 434.56 × 135.61
  4. Step 4: Simplify right side
    289.76x = 58,929.93
  5. Step 5: Solve for x
    x = 58,929.93/289.76
  6. Step 6: Final answer
    x = 203.37

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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.