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Finding the Fourth Proportional to 1,991.70, 2,748.51 and 1,152.41

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Solution

The fourth proportional to 1,991.70, 2,748.51 and 1,152.41 is: 1,590.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.70 : 2,748.51 = 1,152.41 : x
  2. Step 2: Convert to fraction form
    1,991.70/2,748.51 = 1,152.41/x
  3. Step 3: Cross multiply
    1,991.70x = 2,748.51 × 1,152.41
  4. Step 4: Simplify right side
    1,991.70x = 3,167,396.67
  5. Step 5: Solve for x
    x = 3,167,396.67/1,991.70
  6. Step 6: Final answer
    x = 1,590.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.