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Finding the Fourth Proportional to 666.22, 919.53 and 445.25

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Solution

The fourth proportional to 666.22, 919.53 and 445.25 is: 614.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.22 : 919.53 = 445.25 : x
  2. Step 2: Convert to fraction form
    666.22/919.53 = 445.25/x
  3. Step 3: Cross multiply
    666.22x = 919.53 × 445.25
  4. Step 4: Simplify right side
    666.22x = 409,420.73
  5. Step 5: Solve for x
    x = 409,420.73/666.22
  6. Step 6: Final answer
    x = 614.54

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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.