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Finding the Fourth Proportional to 456.15, 629.59 and 279.15

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Solution

The fourth proportional to 456.15, 629.59 and 279.15 is: 385.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.15 : 629.59 = 279.15 : x
  2. Step 2: Convert to fraction form
    456.15/629.59 = 279.15/x
  3. Step 3: Cross multiply
    456.15x = 629.59 × 279.15
  4. Step 4: Simplify right side
    456.15x = 175,750.05
  5. Step 5: Solve for x
    x = 175,750.05/456.15
  6. Step 6: Final answer
    x = 385.29

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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.