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Finding the Fourth Proportional to 4,991.81, 6,891.51 and 3,315.51

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Solution

The fourth proportional to 4,991.81, 6,891.51 and 3,315.51 is: 4,577.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,991.81 : 6,891.51 = 3,315.51 : x
  2. Step 2: Convert to fraction form
    4,991.81/6,891.51 = 3,315.51/x
  3. Step 3: Cross multiply
    4,991.81x = 6,891.51 × 3,315.51
  4. Step 4: Simplify right side
    4,991.81x = 22,848,870.32
  5. Step 5: Solve for x
    x = 22,848,870.32/4,991.81
  6. Step 6: Final answer
    x = 4,577.27

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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.