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Finding the Fourth Proportional to 665.36, 918.24 and 440.91

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Solution

The fourth proportional to 665.36, 918.24 and 440.91 is: 608.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.36 : 918.24 = 440.91 : x
  2. Step 2: Convert to fraction form
    665.36/918.24 = 440.91/x
  3. Step 3: Cross multiply
    665.36x = 918.24 × 440.91
  4. Step 4: Simplify right side
    665.36x = 404,861.20
  5. Step 5: Solve for x
    x = 404,861.20/665.36
  6. Step 6: Final answer
    x = 608.49

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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.