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Finding the Fourth Proportional to 382.35, 573.18 and 138.71

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Solution

The fourth proportional to 382.35, 573.18 and 138.71 is: 207.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.35 : 573.18 = 138.71 : x
  2. Step 2: Convert to fraction form
    382.35/573.18 = 138.71/x
  3. Step 3: Cross multiply
    382.35x = 573.18 × 138.71
  4. Step 4: Simplify right side
    382.35x = 79,502.93
  5. Step 5: Solve for x
    x = 79,502.93/382.35
  6. Step 6: Final answer
    x = 207.93

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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.