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Finding the Fourth Proportional to 382.64, 573.72 and 139.12

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Solution

The fourth proportional to 382.64, 573.72 and 139.12 is: 208.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    382.64 : 573.72 = 139.12 : x
  2. Step 2: Convert to fraction form
    382.64/573.72 = 139.12/x
  3. Step 3: Cross multiply
    382.64x = 573.72 × 139.12
  4. Step 4: Simplify right side
    382.64x = 79,815.93
  5. Step 5: Solve for x
    x = 79,815.93/382.64
  6. Step 6: Final answer
    x = 208.59

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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.