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Finding the Fourth Proportional to 666.22, 1,000.44 and 411.34

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Solution

The fourth proportional to 666.22, 1,000.44 and 411.34 is: 617.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.22 : 1,000.44 = 411.34 : x
  2. Step 2: Convert to fraction form
    666.22/1,000.44 = 411.34/x
  3. Step 3: Cross multiply
    666.22x = 1,000.44 × 411.34
  4. Step 4: Simplify right side
    666.22x = 411,520.99
  5. Step 5: Solve for x
    x = 411,520.99/666.22
  6. Step 6: Final answer
    x = 617.70

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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.