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Finding the Fourth Proportional to 666.30, 919.04 and 439.05

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Solution

The fourth proportional to 666.30, 919.04 and 439.05 is: 605.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.30 : 919.04 = 439.05 : x
  2. Step 2: Convert to fraction form
    666.30/919.04 = 439.05/x
  3. Step 3: Cross multiply
    666.30x = 919.04 × 439.05
  4. Step 4: Simplify right side
    666.30x = 403,504.51
  5. Step 5: Solve for x
    x = 403,504.51/666.30
  6. Step 6: Final answer
    x = 605.59

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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.