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Finding the Fourth Proportional to 380.64, 571.20 and 137.18

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Solution

The fourth proportional to 380.64, 571.20 and 137.18 is: 205.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.64 : 571.20 = 137.18 : x
  2. Step 2: Convert to fraction form
    380.64/571.20 = 137.18/x
  3. Step 3: Cross multiply
    380.64x = 571.20 × 137.18
  4. Step 4: Simplify right side
    380.64x = 78,358.10
  5. Step 5: Solve for x
    x = 78,358.10/380.64
  6. Step 6: Final answer
    x = 205.86

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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.