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Finding the Fourth Proportional to 639.72, 883.04 and 403.83

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Solution

The fourth proportional to 639.72, 883.04 and 403.83 is: 557.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.72 : 883.04 = 403.83 : x
  2. Step 2: Convert to fraction form
    639.72/883.04 = 403.83/x
  3. Step 3: Cross multiply
    639.72x = 883.04 × 403.83
  4. Step 4: Simplify right side
    639.72x = 356,596.02
  5. Step 5: Solve for x
    x = 356,596.02/639.72
  6. Step 6: Final answer
    x = 557.43

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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.