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Finding the Fourth Proportional to 666.77, 1,000.08 and 422.55

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Solution

The fourth proportional to 666.77, 1,000.08 and 422.55 is: 633.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.77 : 1,000.08 = 422.55 : x
  2. Step 2: Convert to fraction form
    666.77/1,000.08 = 422.55/x
  3. Step 3: Cross multiply
    666.77x = 1,000.08 × 422.55
  4. Step 4: Simplify right side
    666.77x = 422,583.80
  5. Step 5: Solve for x
    x = 422,583.80/666.77
  6. Step 6: Final answer
    x = 633.78

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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.