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Finding the Fourth Proportional to 666.43, 918.42 and 479.60

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Solution

The fourth proportional to 666.43, 918.42 and 479.60 is: 660.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.43 : 918.42 = 479.60 : x
  2. Step 2: Convert to fraction form
    666.43/918.42 = 479.60/x
  3. Step 3: Cross multiply
    666.43x = 918.42 × 479.60
  4. Step 4: Simplify right side
    666.43x = 440,471.40
  5. Step 5: Solve for x
    x = 440,471.40/666.43
  6. Step 6: Final answer
    x = 660.94

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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.