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Finding the Fourth Proportional to 666.42, 999.36 and 255.68

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Solution

The fourth proportional to 666.42, 999.36 and 255.68 is: 383.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.42 : 999.36 = 255.68 : x
  2. Step 2: Convert to fraction form
    666.42/999.36 = 255.68/x
  3. Step 3: Cross multiply
    666.42x = 999.36 × 255.68
  4. Step 4: Simplify right side
    666.42x = 255,516.36
  5. Step 5: Solve for x
    x = 255,516.36/666.42
  6. Step 6: Final answer
    x = 383.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.