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Finding the Fourth Proportional to 381.70, 572.36 and 186.72

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Solution

The fourth proportional to 381.70, 572.36 and 186.72 is: 279.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.70 : 572.36 = 186.72 : x
  2. Step 2: Convert to fraction form
    381.70/572.36 = 186.72/x
  3. Step 3: Cross multiply
    381.70x = 572.36 × 186.72
  4. Step 4: Simplify right side
    381.70x = 106,871.06
  5. Step 5: Solve for x
    x = 106,871.06/381.70
  6. Step 6: Final answer
    x = 279.99

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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.