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Finding the Fourth Proportional to 455.28, 629.28 and 345.12

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Solution

The fourth proportional to 455.28, 629.28 and 345.12 is: 477.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.28 : 629.28 = 345.12 : x
  2. Step 2: Convert to fraction form
    455.28/629.28 = 345.12/x
  3. Step 3: Cross multiply
    455.28x = 629.28 × 345.12
  4. Step 4: Simplify right side
    455.28x = 217,177.11
  5. Step 5: Solve for x
    x = 217,177.11/455.28
  6. Step 6: Final answer
    x = 477.02

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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.