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Finding the Fourth Proportional to 664.47, 917.17 and 384.78

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Solution

The fourth proportional to 664.47, 917.17 and 384.78 is: 531.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.47 : 917.17 = 384.78 : x
  2. Step 2: Convert to fraction form
    664.47/917.17 = 384.78/x
  3. Step 3: Cross multiply
    664.47x = 917.17 × 384.78
  4. Step 4: Simplify right side
    664.47x = 352,905.58
  5. Step 5: Solve for x
    x = 352,905.58/664.47
  6. Step 6: Final answer
    x = 531.11

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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.