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Finding the Fourth Proportional to 289.89, 434.40 and 135.64

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Solution

The fourth proportional to 289.89, 434.40 and 135.64 is: 203.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.89 : 434.40 = 135.64 : x
  2. Step 2: Convert to fraction form
    289.89/434.40 = 135.64/x
  3. Step 3: Cross multiply
    289.89x = 434.40 × 135.64
  4. Step 4: Simplify right side
    289.89x = 58,921.44
  5. Step 5: Solve for x
    x = 58,921.44/289.89
  6. Step 6: Final answer
    x = 203.25

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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.