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Finding the Fourth Proportional to 455.84, 629.17 and 312.47

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Solution

The fourth proportional to 455.84, 629.17 and 312.47 is: 431.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.84 : 629.17 = 312.47 : x
  2. Step 2: Convert to fraction form
    455.84/629.17 = 312.47/x
  3. Step 3: Cross multiply
    455.84x = 629.17 × 312.47
  4. Step 4: Simplify right side
    455.84x = 196,592.82
  5. Step 5: Solve for x
    x = 196,592.82/455.84
  6. Step 6: Final answer
    x = 431.28

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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.