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Finding the Fourth Proportional to 20,968.88, 28,937.05 and 11,538.05

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Solution

The fourth proportional to 20,968.88, 28,937.05 and 11,538.05 is: 15,922.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,968.88 : 28,937.05 = 11,538.05 : x
  2. Step 2: Convert to fraction form
    20,968.88/28,937.05 = 11,538.05/x
  3. Step 3: Cross multiply
    20,968.88x = 28,937.05 × 11,538.05
  4. Step 4: Simplify right side
    20,968.88x = 333,876,956.22
  5. Step 5: Solve for x
    x = 333,876,956.22/20,968.88
  6. Step 6: Final answer
    x = 15,922.50

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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.