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Finding the Fourth Proportional to 289.95, 434.82 and 135.78

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Solution

The fourth proportional to 289.95, 434.82 and 135.78 is: 203.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.95 : 434.82 = 135.78 : x
  2. Step 2: Convert to fraction form
    289.95/434.82 = 135.78/x
  3. Step 3: Cross multiply
    289.95x = 434.82 × 135.78
  4. Step 4: Simplify right side
    289.95x = 59,039.86
  5. Step 5: Solve for x
    x = 59,039.86/289.95
  6. Step 6: Final answer
    x = 203.62

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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.