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Finding the Fourth Proportional to 639.70, 882.67 and 377.70

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Solution

The fourth proportional to 639.70, 882.67 and 377.70 is: 521.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.70 : 882.67 = 377.70 : x
  2. Step 2: Convert to fraction form
    639.70/882.67 = 377.70/x
  3. Step 3: Cross multiply
    639.70x = 882.67 × 377.70
  4. Step 4: Simplify right side
    639.70x = 333,384.46
  5. Step 5: Solve for x
    x = 333,384.46/639.70
  6. Step 6: Final answer
    x = 521.16

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.