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Finding the Fourth Proportional to 1,955.67, 2,932.77 and 639.11

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Solution

The fourth proportional to 1,955.67, 2,932.77 and 639.11 is: 958.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,955.67 : 2,932.77 = 639.11 : x
  2. Step 2: Convert to fraction form
    1,955.67/2,932.77 = 639.11/x
  3. Step 3: Cross multiply
    1,955.67x = 2,932.77 × 639.11
  4. Step 4: Simplify right side
    1,955.67x = 1,874,369.97
  5. Step 5: Solve for x
    x = 1,874,369.97/1,955.67
  6. Step 6: Final answer
    x = 958.43

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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.