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Finding the Fourth Proportional to 666.70, 919.81 and 445.79

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Solution

The fourth proportional to 666.70, 919.81 and 445.79 is: 615.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.70 : 919.81 = 445.79 : x
  2. Step 2: Convert to fraction form
    666.70/919.81 = 445.79/x
  3. Step 3: Cross multiply
    666.70x = 919.81 × 445.79
  4. Step 4: Simplify right side
    666.70x = 410,042.10
  5. Step 5: Solve for x
    x = 410,042.10/666.70
  6. Step 6: Final answer
    x = 615.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.