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Finding the Fourth Proportional to 666.53, 999.80 and 276.44

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Solution

The fourth proportional to 666.53, 999.80 and 276.44 is: 414.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.53 : 999.80 = 276.44 : x
  2. Step 2: Convert to fraction form
    666.53/999.80 = 276.44/x
  3. Step 3: Cross multiply
    666.53x = 999.80 × 276.44
  4. Step 4: Simplify right side
    666.53x = 276,378.33
  5. Step 5: Solve for x
    x = 276,378.33/666.53
  6. Step 6: Final answer
    x = 414.65

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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.