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Finding the Fourth Proportional to 666.20, 999.30 and 481.40

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Solution

The fourth proportional to 666.20, 999.30 and 481.40 is: 722.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.20 : 999.30 = 481.40 : x
  2. Step 2: Convert to fraction form
    666.20/999.30 = 481.40/x
  3. Step 3: Cross multiply
    666.20x = 999.30 × 481.40
  4. Step 4: Simplify right side
    666.20x = 481,063.02
  5. Step 5: Solve for x
    x = 481,063.02/666.20
  6. Step 6: Final answer
    x = 722.10

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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.