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Finding the Fourth Proportional to 455.78, 629.03 and 281.13

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Solution

The fourth proportional to 455.78, 629.03 and 281.13 is: 387.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.78 : 629.03 = 281.13 : x
  2. Step 2: Convert to fraction form
    455.78/629.03 = 281.13/x
  3. Step 3: Cross multiply
    455.78x = 629.03 × 281.13
  4. Step 4: Simplify right side
    455.78x = 176,839.20
  5. Step 5: Solve for x
    x = 176,839.20/455.78
  6. Step 6: Final answer
    x = 387.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.