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Finding the Fourth Proportional to 639.11, 959.28 and 501.82

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Solution

The fourth proportional to 639.11, 959.28 and 501.82 is: 753.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.11 : 959.28 = 501.82 : x
  2. Step 2: Convert to fraction form
    639.11/959.28 = 501.82/x
  3. Step 3: Cross multiply
    639.11x = 959.28 × 501.82
  4. Step 4: Simplify right side
    639.11x = 481,381.61
  5. Step 5: Solve for x
    x = 481,381.61/639.11
  6. Step 6: Final answer
    x = 753.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.