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Finding the Fourth Proportional to 18,991.31, 28,484.73 and 11,950.55

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Solution

The fourth proportional to 18,991.31, 28,484.73 and 11,950.55 is: 17,924.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.31 : 28,484.73 = 11,950.55 : x
  2. Step 2: Convert to fraction form
    18,991.31/28,484.73 = 11,950.55/x
  3. Step 3: Cross multiply
    18,991.31x = 28,484.73 × 11,950.55
  4. Step 4: Simplify right side
    18,991.31x = 340,408,130.35
  5. Step 5: Solve for x
    x = 340,408,130.35/18,991.31
  6. Step 6: Final answer
    x = 17,924.42

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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.