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Finding the Fourth Proportional to 639.66, 959.51 and 365.61

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Solution

The fourth proportional to 639.66, 959.51 and 365.61 is: 548.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.66 : 959.51 = 365.61 : x
  2. Step 2: Convert to fraction form
    639.66/959.51 = 365.61/x
  3. Step 3: Cross multiply
    639.66x = 959.51 × 365.61
  4. Step 4: Simplify right side
    639.66x = 350,810.96
  5. Step 5: Solve for x
    x = 350,810.96/639.66
  6. Step 6: Final answer
    x = 548.43

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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.