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Finding the Fourth Proportional to 18,991.99, 28,484.70 and 5,137.75

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Solution

The fourth proportional to 18,991.99, 28,484.70 and 5,137.75 is: 7,705.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.99 : 28,484.70 = 5,137.75 : x
  2. Step 2: Convert to fraction form
    18,991.99/28,484.70 = 5,137.75/x
  3. Step 3: Cross multiply
    18,991.99x = 28,484.70 × 5,137.75
  4. Step 4: Simplify right side
    18,991.99x = 146,347,267.43
  5. Step 5: Solve for x
    x = 146,347,267.43/18,991.99
  6. Step 6: Final answer
    x = 7,705.74

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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.