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Finding the Fourth Proportional to 447.19, 617.42 and 289.90

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Solution

The fourth proportional to 447.19, 617.42 and 289.90 is: 400.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.19 : 617.42 = 289.90 : x
  2. Step 2: Convert to fraction form
    447.19/617.42 = 289.90/x
  3. Step 3: Cross multiply
    447.19x = 617.42 × 289.90
  4. Step 4: Simplify right side
    447.19x = 178,990.06
  5. Step 5: Solve for x
    x = 178,990.06/447.19
  6. Step 6: Final answer
    x = 400.26

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Double scale
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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.