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Finding the Fourth Proportional to 289.99, 434.80 and 135.85

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Solution

The fourth proportional to 289.99, 434.80 and 135.85 is: 203.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.99 : 434.80 = 135.85 : x
  2. Step 2: Convert to fraction form
    289.99/434.80 = 135.85/x
  3. Step 3: Cross multiply
    289.99x = 434.80 × 135.85
  4. Step 4: Simplify right side
    289.99x = 59,065.41
  5. Step 5: Solve for x
    x = 59,065.41/289.99
  6. Step 6: Final answer
    x = 203.68

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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.