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Finding the Fourth Proportional to 666.74, 999.07 and 422.75

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Solution

The fourth proportional to 666.74, 999.07 and 422.75 is: 633.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.74 : 999.07 = 422.75 : x
  2. Step 2: Convert to fraction form
    666.74/999.07 = 422.75/x
  3. Step 3: Cross multiply
    666.74x = 999.07 × 422.75
  4. Step 4: Simplify right side
    666.74x = 422,356.84
  5. Step 5: Solve for x
    x = 422,356.84/666.74
  6. Step 6: Final answer
    x = 633.47

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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.