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Finding the Fourth Proportional to 381.76, 572.64 and 289.78

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Solution

The fourth proportional to 381.76, 572.64 and 289.78 is: 434.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.76 : 572.64 = 289.78 : x
  2. Step 2: Convert to fraction form
    381.76/572.64 = 289.78/x
  3. Step 3: Cross multiply
    381.76x = 572.64 × 289.78
  4. Step 4: Simplify right side
    381.76x = 165,937.92
  5. Step 5: Solve for x
    x = 165,937.92/381.76
  6. Step 6: Final answer
    x = 434.66

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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.