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Finding the Fourth Proportional to 639.43, 882.50 and 492.89

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Solution

The fourth proportional to 639.43, 882.50 and 492.89 is: 680.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.43 : 882.50 = 492.89 : x
  2. Step 2: Convert to fraction form
    639.43/882.50 = 492.89/x
  3. Step 3: Cross multiply
    639.43x = 882.50 × 492.89
  4. Step 4: Simplify right side
    639.43x = 434,968.55
  5. Step 5: Solve for x
    x = 434,968.55/639.43
  6. Step 6: Final answer
    x = 680.25

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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.