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Finding the Fourth Proportional to 20,949.87, 28,911.03 and 11,518.50

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Solution

The fourth proportional to 20,949.87, 28,911.03 and 11,518.50 is: 15,895.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,949.87 : 28,911.03 = 11,518.50 : x
  2. Step 2: Convert to fraction form
    20,949.87/28,911.03 = 11,518.50/x
  3. Step 3: Cross multiply
    20,949.87x = 28,911.03 × 11,518.50
  4. Step 4: Simplify right side
    20,949.87x = 333,011,699.06
  5. Step 5: Solve for x
    x = 333,011,699.06/20,949.87
  6. Step 6: Final answer
    x = 15,895.65

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1.5x scale

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.