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Finding the Fourth Proportional to 381.60, 571.86 and 207.81

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Solution

The fourth proportional to 381.60, 571.86 and 207.81 is: 311.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.60 : 571.86 = 207.81 : x
  2. Step 2: Convert to fraction form
    381.60/571.86 = 207.81/x
  3. Step 3: Cross multiply
    381.60x = 571.86 × 207.81
  4. Step 4: Simplify right side
    381.60x = 118,838.23
  5. Step 5: Solve for x
    x = 118,838.23/381.60
  6. Step 6: Final answer
    x = 311.42

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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.