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Finding the Fourth Proportional to 639.79, 882.90 and 360.03

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Solution

The fourth proportional to 639.79, 882.90 and 360.03 is: 496.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.79 : 882.90 = 360.03 : x
  2. Step 2: Convert to fraction form
    639.79/882.90 = 360.03/x
  3. Step 3: Cross multiply
    639.79x = 882.90 × 360.03
  4. Step 4: Simplify right side
    639.79x = 317,868.53
  5. Step 5: Solve for x
    x = 317,868.53/639.79
  6. Step 6: Final answer
    x = 496.83

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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.