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Finding the Fourth Proportional to 1,991.56, 2,989.26 and 1,477

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Solution

The fourth proportional to 1,991.56, 2,989.26 and 1,477 is: 2,216.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.56 : 2,989.26 = 1,477 : x
  2. Step 2: Convert to fraction form
    1,991.56/2,989.26 = 1,477/x
  3. Step 3: Cross multiply
    1,991.56x = 2,989.26 × 1,477
  4. Step 4: Simplify right side
    1,991.56x = 4,415,137.02
  5. Step 5: Solve for x
    x = 4,415,137.02/1,991.56
  6. Step 6: Final answer
    x = 2,216.92

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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.