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Finding the Fourth Proportional to 464.54, 640.31 and 316.91

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Solution

The fourth proportional to 464.54, 640.31 and 316.91 is: 436.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.54 : 640.31 = 316.91 : x
  2. Step 2: Convert to fraction form
    464.54/640.31 = 316.91/x
  3. Step 3: Cross multiply
    464.54x = 640.31 × 316.91
  4. Step 4: Simplify right side
    464.54x = 202,920.66
  5. Step 5: Solve for x
    x = 202,920.66/464.54
  6. Step 6: Final answer
    x = 436.83

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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.