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Finding the Fourth Proportional to 639.93, 883.54 and 490.29

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Solution

The fourth proportional to 639.93, 883.54 and 490.29 is: 676.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.93 : 883.54 = 490.29 : x
  2. Step 2: Convert to fraction form
    639.93/883.54 = 490.29/x
  3. Step 3: Cross multiply
    639.93x = 883.54 × 490.29
  4. Step 4: Simplify right side
    639.93x = 433,191.44
  5. Step 5: Solve for x
    x = 433,191.44/639.93
  6. Step 6: Final answer
    x = 676.93

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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.