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Finding the Fourth Proportional to 2,991.91, 4,488.05 and 912.06

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Solution

The fourth proportional to 2,991.91, 4,488.05 and 912.06 is: 1,368.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,991.91 : 4,488.05 = 912.06 : x
  2. Step 2: Convert to fraction form
    2,991.91/4,488.05 = 912.06/x
  3. Step 3: Cross multiply
    2,991.91x = 4,488.05 × 912.06
  4. Step 4: Simplify right side
    2,991.91x = 4,093,370.88
  5. Step 5: Solve for x
    x = 4,093,370.88/2,991.91
  6. Step 6: Final answer
    x = 1,368.15

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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.