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Finding the Fourth Proportional to 7,185.70, 10,779.16 and 1,991.56

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Solution

The fourth proportional to 7,185.70, 10,779.16 and 1,991.56 is: 2,987.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,185.70 : 10,779.16 = 1,991.56 : x
  2. Step 2: Convert to fraction form
    7,185.70/10,779.16 = 1,991.56/x
  3. Step 3: Cross multiply
    7,185.70x = 10,779.16 × 1,991.56
  4. Step 4: Simplify right side
    7,185.70x = 21,467,343.89
  5. Step 5: Solve for x
    x = 21,467,343.89/7,185.70
  6. Step 6: Final answer
    x = 2,987.51

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1.5x scale

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.