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Finding the Fourth Proportional to 20,991.87, 28,968.98 and 11,560.50

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Solution

The fourth proportional to 20,991.87, 28,968.98 and 11,560.50 is: 15,953.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.87 : 28,968.98 = 11,560.50 : x
  2. Step 2: Convert to fraction form
    20,991.87/28,968.98 = 11,560.50/x
  3. Step 3: Cross multiply
    20,991.87x = 28,968.98 × 11,560.50
  4. Step 4: Simplify right side
    20,991.87x = 334,895,893.29
  5. Step 5: Solve for x
    x = 334,895,893.29/20,991.87
  6. Step 6: Final answer
    x = 15,953.60

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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.