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Finding the Fourth Proportional to 665.87, 918.62 and 396.63

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Solution

The fourth proportional to 665.87, 918.62 and 396.63 is: 547.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.87 : 918.62 = 396.63 : x
  2. Step 2: Convert to fraction form
    665.87/918.62 = 396.63/x
  3. Step 3: Cross multiply
    665.87x = 918.62 × 396.63
  4. Step 4: Simplify right side
    665.87x = 364,352.25
  5. Step 5: Solve for x
    x = 364,352.25/665.87
  6. Step 6: Final answer
    x = 547.18

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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.