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Finding the Fourth Proportional to 255.20, 381.60 and 190.40

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Solution

The fourth proportional to 255.20, 381.60 and 190.40 is: 284.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.20 : 381.60 = 190.40 : x
  2. Step 2: Convert to fraction form
    255.20/381.60 = 190.40/x
  3. Step 3: Cross multiply
    255.20x = 381.60 × 190.40
  4. Step 4: Simplify right side
    255.20x = 72,656.64
  5. Step 5: Solve for x
    x = 72,656.64/255.20
  6. Step 6: Final answer
    x = 284.70

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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.