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Finding the Fourth Proportional to 456.32, 629.79 and 290.61

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Solution

The fourth proportional to 456.32, 629.79 and 290.61 is: 401.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.32 : 629.79 = 290.61 : x
  2. Step 2: Convert to fraction form
    456.32/629.79 = 290.61/x
  3. Step 3: Cross multiply
    456.32x = 629.79 × 290.61
  4. Step 4: Simplify right side
    456.32x = 183,023.27
  5. Step 5: Solve for x
    x = 183,023.27/456.32
  6. Step 6: Final answer
    x = 401.09

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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.