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Finding the Fourth Proportional to 20,991.93, 28,968.93 and 11,431.89

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Solution

The fourth proportional to 20,991.93, 28,968.93 and 11,431.89 is: 15,776.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.93 : 28,968.93 = 11,431.89 : x
  2. Step 2: Convert to fraction form
    20,991.93/28,968.93 = 11,431.89/x
  3. Step 3: Cross multiply
    20,991.93x = 28,968.93 × 11,431.89
  4. Step 4: Simplify right side
    20,991.93x = 331,169,621.18
  5. Step 5: Solve for x
    x = 331,169,621.18/20,991.93
  6. Step 6: Final answer
    x = 15,776.04

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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.