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Finding the Fourth Proportional to 255.47, 381.64 and 204.21

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Solution

The fourth proportional to 255.47, 381.64 and 204.21 is: 305.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.47 : 381.64 = 204.21 : x
  2. Step 2: Convert to fraction form
    255.47/381.64 = 204.21/x
  3. Step 3: Cross multiply
    255.47x = 381.64 × 204.21
  4. Step 4: Simplify right side
    255.47x = 77,934.70
  5. Step 5: Solve for x
    x = 77,934.70/255.47
  6. Step 6: Final answer
    x = 305.06

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.