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Finding the Fourth Proportional to 666.56, 999.69 and 422.74

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Solution

The fourth proportional to 666.56, 999.69 and 422.74 is: 634.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.56 : 999.69 = 422.74 : x
  2. Step 2: Convert to fraction form
    666.56/999.69 = 422.74/x
  3. Step 3: Cross multiply
    666.56x = 999.69 × 422.74
  4. Step 4: Simplify right side
    666.56x = 422,608.95
  5. Step 5: Solve for x
    x = 422,608.95/666.56
  6. Step 6: Final answer
    x = 634.01

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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.