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Finding the Fourth Proportional to 666.88, 998.68 and 422.68

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Solution

The fourth proportional to 666.88, 998.68 and 422.68 is: 632.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.88 : 998.68 = 422.68 : x
  2. Step 2: Convert to fraction form
    666.88/998.68 = 422.68/x
  3. Step 3: Cross multiply
    666.88x = 998.68 × 422.68
  4. Step 4: Simplify right side
    666.88x = 422,122.06
  5. Step 5: Solve for x
    x = 422,122.06/666.88
  6. Step 6: Final answer
    x = 632.98

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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.