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Finding the Fourth Proportional to 648.53, 893.92 and 438.64

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Solution

The fourth proportional to 648.53, 893.92 and 438.64 is: 604.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.53 : 893.92 = 438.64 : x
  2. Step 2: Convert to fraction form
    648.53/893.92 = 438.64/x
  3. Step 3: Cross multiply
    648.53x = 893.92 × 438.64
  4. Step 4: Simplify right side
    648.53x = 392,109.07
  5. Step 5: Solve for x
    x = 392,109.07/648.53
  6. Step 6: Final answer
    x = 604.61

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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.