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Finding the Fourth Proportional to 381.76, 572.29 and 186.65

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Solution

The fourth proportional to 381.76, 572.29 and 186.65 is: 279.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.76 : 572.29 = 186.65 : x
  2. Step 2: Convert to fraction form
    381.76/572.29 = 186.65/x
  3. Step 3: Cross multiply
    381.76x = 572.29 × 186.65
  4. Step 4: Simplify right side
    381.76x = 106,817.93
  5. Step 5: Solve for x
    x = 106,817.93/381.76
  6. Step 6: Final answer
    x = 279.80

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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.