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Finding the Fourth Proportional to 2,992.30, 4,487.09 and 912.56

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Solution

The fourth proportional to 2,992.30, 4,487.09 and 912.56 is: 1,368.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,992.30 : 4,487.09 = 912.56 : x
  2. Step 2: Convert to fraction form
    2,992.30/4,487.09 = 912.56/x
  3. Step 3: Cross multiply
    2,992.30x = 4,487.09 × 912.56
  4. Step 4: Simplify right side
    2,992.30x = 4,094,711.85
  5. Step 5: Solve for x
    x = 4,094,711.85/2,992.30
  6. Step 6: Final answer
    x = 1,368.42

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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.