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Finding the Fourth Proportional to 664.25, 916.60 and 365.49

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Solution

The fourth proportional to 664.25, 916.60 and 365.49 is: 504.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.25 : 916.60 = 365.49 : x
  2. Step 2: Convert to fraction form
    664.25/916.60 = 365.49/x
  3. Step 3: Cross multiply
    664.25x = 916.60 × 365.49
  4. Step 4: Simplify right side
    664.25x = 335,011.34
  5. Step 5: Solve for x
    x = 335,011.34/664.25
  6. Step 6: Final answer
    x = 504.35

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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.