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Finding the Fourth Proportional to 664.54, 917.12 and 384.85

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Solution

The fourth proportional to 664.54, 917.12 and 384.85 is: 531.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.54 : 917.12 = 384.85 : x
  2. Step 2: Convert to fraction form
    664.54/917.12 = 384.85/x
  3. Step 3: Cross multiply
    664.54x = 917.12 × 384.85
  4. Step 4: Simplify right side
    664.54x = 352,951.71
  5. Step 5: Solve for x
    x = 352,951.71/664.54
  6. Step 6: Final answer
    x = 531.12

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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.