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Finding the Fourth Proportional to 665.72, 918.77 and 371.09

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Solution

The fourth proportional to 665.72, 918.77 and 371.09 is: 512.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.72 : 918.77 = 371.09 : x
  2. Step 2: Convert to fraction form
    665.72/918.77 = 371.09/x
  3. Step 3: Cross multiply
    665.72x = 918.77 × 371.09
  4. Step 4: Simplify right side
    665.72x = 340,946.36
  5. Step 5: Solve for x
    x = 340,946.36/665.72
  6. Step 6: Final answer
    x = 512.15

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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.