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Finding the Fourth Proportional to 447.19, 671.60 and 389.82

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Solution

The fourth proportional to 447.19, 671.60 and 389.82 is: 585.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.19 : 671.60 = 389.82 : x
  2. Step 2: Convert to fraction form
    447.19/671.60 = 389.82/x
  3. Step 3: Cross multiply
    447.19x = 671.60 × 389.82
  4. Step 4: Simplify right side
    447.19x = 261,803.11
  5. Step 5: Solve for x
    x = 261,803.11/447.19
  6. Step 6: Final answer
    x = 585.44

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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.