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Finding the Fourth Proportional to 666.27, 999.54 and 276.21

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Solution

The fourth proportional to 666.27, 999.54 and 276.21 is: 414.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.27 : 999.54 = 276.21 : x
  2. Step 2: Convert to fraction form
    666.27/999.54 = 276.21/x
  3. Step 3: Cross multiply
    666.27x = 999.54 × 276.21
  4. Step 4: Simplify right side
    666.27x = 276,082.94
  5. Step 5: Solve for x
    x = 276,082.94/666.27
  6. Step 6: Final answer
    x = 414.37

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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.