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Finding the Fourth Proportional to 289.62, 435.03 and 279.90

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Solution

The fourth proportional to 289.62, 435.03 and 279.90 is: 420.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.62 : 435.03 = 279.90 : x
  2. Step 2: Convert to fraction form
    289.62/435.03 = 279.90/x
  3. Step 3: Cross multiply
    289.62x = 435.03 × 279.90
  4. Step 4: Simplify right side
    289.62x = 121,764.90
  5. Step 5: Solve for x
    x = 121,764.90/289.62
  6. Step 6: Final answer
    x = 420.43

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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.