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Finding the Fourth Proportional to 611.64, 919.38 and 441.72

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Solution

The fourth proportional to 611.64, 919.38 and 441.72 is: 663.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.64 : 919.38 = 441.72 : x
  2. Step 2: Convert to fraction form
    611.64/919.38 = 441.72/x
  3. Step 3: Cross multiply
    611.64x = 919.38 × 441.72
  4. Step 4: Simplify right side
    611.64x = 406,108.53
  5. Step 5: Solve for x
    x = 406,108.53/611.64
  6. Step 6: Final answer
    x = 663.97

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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.