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Finding the Fourth Proportional to 464.25, 640.68 and 257.25

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Solution

The fourth proportional to 464.25, 640.68 and 257.25 is: 355.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.25 : 640.68 = 257.25 : x
  2. Step 2: Convert to fraction form
    464.25/640.68 = 257.25/x
  3. Step 3: Cross multiply
    464.25x = 640.68 × 257.25
  4. Step 4: Simplify right side
    464.25x = 164,814.93
  5. Step 5: Solve for x
    x = 164,814.93/464.25
  6. Step 6: Final answer
    x = 355.01

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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.