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Finding the Fourth Proportional to 462.72, 638.25 and 287.94

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Solution

The fourth proportional to 462.72, 638.25 and 287.94 is: 397.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.72 : 638.25 = 287.94 : x
  2. Step 2: Convert to fraction form
    462.72/638.25 = 287.94/x
  3. Step 3: Cross multiply
    462.72x = 638.25 × 287.94
  4. Step 4: Simplify right side
    462.72x = 183,777.71
  5. Step 5: Solve for x
    x = 183,777.71/462.72
  6. Step 6: Final answer
    x = 397.17

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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.