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Finding the Fourth Proportional to 2,927.54, 4,391.31 and 979.88

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Solution

The fourth proportional to 2,927.54, 4,391.31 and 979.88 is: 1,469.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,927.54 : 4,391.31 = 979.88 : x
  2. Step 2: Convert to fraction form
    2,927.54/4,391.31 = 979.88/x
  3. Step 3: Cross multiply
    2,927.54x = 4,391.31 × 979.88
  4. Step 4: Simplify right side
    2,927.54x = 4,302,956.84
  5. Step 5: Solve for x
    x = 4,302,956.84/2,927.54
  6. Step 6: Final answer
    x = 1,469.82

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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.