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Finding the Fourth Proportional to 289.10, 432.57 and 220.38

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Solution

The fourth proportional to 289.10, 432.57 and 220.38 is: 329.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.10 : 432.57 = 220.38 : x
  2. Step 2: Convert to fraction form
    289.10/432.57 = 220.38/x
  3. Step 3: Cross multiply
    289.10x = 432.57 × 220.38
  4. Step 4: Simplify right side
    289.10x = 95,329.78
  5. Step 5: Solve for x
    x = 95,329.78/289.10
  6. Step 6: Final answer
    x = 329.75

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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.