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Finding the Fourth Proportional to 639.55, 882.66 and 359.80

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Solution

The fourth proportional to 639.55, 882.66 and 359.80 is: 496.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.55 : 882.66 = 359.80 : x
  2. Step 2: Convert to fraction form
    639.55/882.66 = 359.80/x
  3. Step 3: Cross multiply
    639.55x = 882.66 × 359.80
  4. Step 4: Simplify right side
    639.55x = 317,581.07
  5. Step 5: Solve for x
    x = 317,581.07/639.55
  6. Step 6: Final answer
    x = 496.57

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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.