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Finding the Fourth Proportional to 664.42, 916.42 and 428.44

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Solution

The fourth proportional to 664.42, 916.42 and 428.44 is: 590.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.42 : 916.42 = 428.44 : x
  2. Step 2: Convert to fraction form
    664.42/916.42 = 428.44/x
  3. Step 3: Cross multiply
    664.42x = 916.42 × 428.44
  4. Step 4: Simplify right side
    664.42x = 392,630.98
  5. Step 5: Solve for x
    x = 392,630.98/664.42
  6. Step 6: Final answer
    x = 590.94

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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.