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Finding the Fourth Proportional to 639.91, 883.10 and 377.83

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Solution

The fourth proportional to 639.91, 883.10 and 377.83 is: 521.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.91 : 883.10 = 377.83 : x
  2. Step 2: Convert to fraction form
    639.91/883.10 = 377.83/x
  3. Step 3: Cross multiply
    639.91x = 883.10 × 377.83
  4. Step 4: Simplify right side
    639.91x = 333,661.67
  5. Step 5: Solve for x
    x = 333,661.67/639.91
  6. Step 6: Final answer
    x = 521.42

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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.