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Finding the Fourth Proportional to 664.88, 917.40 and 385.16

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Solution

The fourth proportional to 664.88, 917.40 and 385.16 is: 531.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.88 : 917.40 = 385.16 : x
  2. Step 2: Convert to fraction form
    664.88/917.40 = 385.16/x
  3. Step 3: Cross multiply
    664.88x = 917.40 × 385.16
  4. Step 4: Simplify right side
    664.88x = 353,341.56
  5. Step 5: Solve for x
    x = 353,341.56/664.88
  6. Step 6: Final answer
    x = 531.43

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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.