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Finding the Fourth Proportional to 665.85, 918.84 and 371.12

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Solution

The fourth proportional to 665.85, 918.84 and 371.12 is: 512.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.85 : 918.84 = 371.12 : x
  2. Step 2: Convert to fraction form
    665.85/918.84 = 371.12/x
  3. Step 3: Cross multiply
    665.85x = 918.84 × 371.12
  4. Step 4: Simplify right side
    665.85x = 340,999.90
  5. Step 5: Solve for x
    x = 340,999.90/665.85
  6. Step 6: Final answer
    x = 512.13

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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.