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Finding the Fourth Proportional to 665.71, 918.25 and 441.64

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Solution

The fourth proportional to 665.71, 918.25 and 441.64 is: 609.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.71 : 918.25 = 441.64 : x
  2. Step 2: Convert to fraction form
    665.71/918.25 = 441.64/x
  3. Step 3: Cross multiply
    665.71x = 918.25 × 441.64
  4. Step 4: Simplify right side
    665.71x = 405,532.53
  5. Step 5: Solve for x
    x = 405,532.53/665.71
  6. Step 6: Final answer
    x = 609.18

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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.