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Finding the Fourth Proportional to 664.79, 917.43 and 385.07

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Solution

The fourth proportional to 664.79, 917.43 and 385.07 is: 531.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    664.79 : 917.43 = 385.07 : x
  2. Step 2: Convert to fraction form
    664.79/917.43 = 385.07/x
  3. Step 3: Cross multiply
    664.79x = 917.43 × 385.07
  4. Step 4: Simplify right side
    664.79x = 353,274.77
  5. Step 5: Solve for x
    x = 353,274.77/664.79
  6. Step 6: Final answer
    x = 531.41

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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.