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Finding the Fourth Proportional to 665.18, 918.17 and 385.48

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Solution

The fourth proportional to 665.18, 918.17 and 385.48 is: 532.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.18 : 918.17 = 385.48 : x
  2. Step 2: Convert to fraction form
    665.18/918.17 = 385.48/x
  3. Step 3: Cross multiply
    665.18x = 918.17 × 385.48
  4. Step 4: Simplify right side
    665.18x = 353,936.17
  5. Step 5: Solve for x
    x = 353,936.17/665.18
  6. Step 6: Final answer
    x = 532.09

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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.