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Finding the Fourth Proportional to 665.67, 918.66 and 385.97

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Solution

The fourth proportional to 665.67, 918.66 and 385.97 is: 532.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.67 : 918.66 = 385.97 : x
  2. Step 2: Convert to fraction form
    665.67/918.66 = 385.97/x
  3. Step 3: Cross multiply
    665.67x = 918.66 × 385.97
  4. Step 4: Simplify right side
    665.67x = 354,575.05
  5. Step 5: Solve for x
    x = 354,575.05/665.67
  6. Step 6: Final answer
    x = 532.66

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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.