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Finding the Fourth Proportional to 664.72, 917.36 and 384.96

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Solution

The fourth proportional to 664.72, 917.36 and 384.96 is: 531.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.72 : 917.36 = 384.96 : x
  2. Step 2: Convert to fraction form
    664.72/917.36 = 384.96/x
  3. Step 3: Cross multiply
    664.72x = 917.36 × 384.96
  4. Step 4: Simplify right side
    664.72x = 353,149.86
  5. Step 5: Solve for x
    x = 353,149.86/664.72
  6. Step 6: Final answer
    x = 531.28

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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.