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Finding the Fourth Proportional to 639.61, 882.63 and 377.62

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Solution

The fourth proportional to 639.61, 882.63 and 377.62 is: 521.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.61 : 882.63 = 377.62 : x
  2. Step 2: Convert to fraction form
    639.61/882.63 = 377.62/x
  3. Step 3: Cross multiply
    639.61x = 882.63 × 377.62
  4. Step 4: Simplify right side
    639.61x = 333,298.74
  5. Step 5: Solve for x
    x = 333,298.74/639.61
  6. Step 6: Final answer
    x = 521.10

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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.